To clairfy: it is my opinion that adults without children should not wait in line to meet characters. It makes the wait for kids longer. The characters are for kids.
I realize this is an unpopular opinion, but here we are.
Do you also hold this stance on attractions like Dumbo, the carousel, etc.? Because I can tell you plenty of adults go on these rides as well.
I feel this is where I need to remind one of the quote from DIsney himself regarding the opening of his park:
"To all that come to this happy place, welcome.
Disneyland is your land. Here
age relives fond memories of the past, and here
youth may savor the challenge and promise of the future."
When I first visited as an adult, I used to be of the same mind that characters are just for kids. But when I found myself solo in the parks as my dad rested from a cold and not much to do (our FP game was woefully underdeveloped at the time), I opted to do what I had deemed in my mind the "dumbest thing a 33 yr old man can do", which was visit the Disney Princesses
At the end of the trip, my dad and I thought we were a one & done group. But the more I thought about it, the more I thought about how much fun I had meeting the characters. I realized we hadn't really fully immersed ourselves in what the parks are really about. So we opted for another trip. I planned around doing a character focused experience (including meals). Our experience was much better by accepting that we could just be kids again.
On my last trip, it wasn't as character focused, but I disneybounded as Flynn Rider. I met Rapunzel and Flynn during an
MVMCP. They were both so excited about the outfit. He signed my satchel. They asked how my smolder was and said I hadn't perfected it. They told me "practice makes perfect". And I now have a hilarious picture of all my awkwardness on full display because of my failed attempt to smolder.
So while you might be entitled to your opinion, please don't try to take these experiences away from adults. There is no age limit for guests when it comes to the memories created.