We got back 4 days ago and my advice is BRING THE BUG SPRAY! My legs were covered with bites. The temps were in the mid 80's during the day and low 70's, upper 60's at night. It never even crossed my mind to bring spray, and boy did I regret it.
I found that we did not need suntan lotion at all on the days we went to the parks. I guess going in and out of all the rides limited our sun exposure. But I did start to burn one afternoon when we spent the day relaxing at the pool. My advice: if you're spending time at the pool, bring the lotion.
One other note: I had what I thought was a mosquito bite on my finger...it started out red/itchy and with a pus filled bump in the center. The next day it looked as though it was filling with blood. It was a big round area that was bright red. Disney called the EMT's for me and luckily, one of them recognized it as an ant bite. He showed me his scars and says he gets bitten all the time. I use the word luckily only because I was just so nervous looking at it. Once I knew I'd be ok, I was able to relax and forget about it. All the other Disney people I showed it to said I should go to a doctor immediately. I didn't want to waste 2or 3 hours of my vacation time at the doctor. So, if any of you get some wierd red, blood filled blister looking thing on your body, it may just be an ant bite!