On the casino front: I don't have anything against casinos. I enjoy a casino now and then. They just don't hold my interest for long periods of time (I don't like card games and slot machines aren't entertaining for long), plus if I want to go to a casino I have my pick of them in bars, restaurants...gas stations...laundromats...Montana has a lot of casinos. It's nothing special for me. I did play a lot of Bingo on my Disney cruise; it was as much about the bad jokes and general atmosphere as the game itself for me. And no skill? You've never watched me scramble to punch numbers when I've bought too many cards for one sitting.
On the adult with no kids front: I went as a solo adult on
DCL and loved it. If I go again, it'll be either solo again or with one other adult. I honestly didn't even notice the kids on the ship most of the time, since apart from Marvel Day at Sea and the pirate party I didn't really spend time in the same areas/doing the same activities as the children. I kept pretty busy, too, apart from the day I just chilled out in the adults-only pool area. I met two other solo adults on the trip, and I'm sure there were plenty of adults-only families/groups I didn't personally meet. I was never made to feel out of place.
On the Disney feel front: I used to think it wouldn't feel particularly Disney, too. That it'd just be a bunch of characters in a neutral location and the Disney aspects would feel out of place rather than central to the cruise. Then I went on the cruise and that wasn't how I felt about it at all while I was there. It's not Disney in the sense that it's a Disney park, but it's very Disney in the sense that it feels like a WDW resort hotel. The decor, the demeanor of the CMs, the little things like the announcement tone being a line from a Disney song...it felt like I was at a Disney resort.
My verdict: I enjoyed the heck out of my Disney cruise...but I'm honestly pretty torn on whether my next trip will be DCL or WDW. As a solo traveler I actually found it easier to keep my mind "in the moment" on the cruise than I often do when I'm alone in the parks. I don't know if that's just because it was more novel for me than the parks are at this point in my life, because I made the choice not to get a data package and didn't have the internet to distract me, or if it's because of the nature of the travel style and the activities offered. I definitely found it
much easier to make connections with the people I met; the CMs who ran the types of activities I attended quickly learned my name, I met several other solo travelers I regularly sat with whenever we went to the same activities, and I'd run into the same people multiple times and have things to talk about with them while in line for characters, etc. because we'd actually met before. At WDW I can strike up a conversation here and there, but it's so big that you're never going to see the same person twice. There are advantages to that, of course (sometimes I do like to just be left alone), but it makes for a different vacation feel.
On the other hand, I adore the attractions at WDW, and I like having a wider range of places to go and things to do on any given day. I like the wide array of restaurants (and because I'm a solo traveler it's not as hard for me to get in at the last minute, so I don't have the disadvantage of having to plan so extensively). Though I liked the social connections on my cruise, I do also sometimes like not to feel like I need to make conversation, and being solo in WDW is a constant free pass to opt out of that by just not striking up conversations with anyone. And did I mention the attractions? I've always
loved rides in general and I'm fascinated by animatronics.
So I don't know. I plan to do one or the other following the 2020 WDW Marathon, and I'm still drawing up all kinds of itineraries and options and comparisons to try to convince myself one way or the other. Both appeal in some ways, both fail to appeal in some ways. Both are expensive. Both would be fine ways to recover from a marathon, and both would be fun ways to get some me-time away from home and work. The problem isn't that one is better than the other; the problem is that they're similarly priced vacations with completely different approaches and feels to them and I'm stuck comparing apples to oranges.