I went about 18 months ago and weighed over 300#. I was able to go on most everything that I wanted to. I was able to do TOT, SM, Splash Mountain, TMRR, SGE, Buzz, and many more without much problem. The holding handles on TOT made the seat a little snug and got some bruises from it, same with Stich. Everything else was fine. The All-Ears page was really helpful. Such as pulling out the seatbelts before you sit down! That was really helpful!
Anyway, Go...Have a good time, and don't go through the Turn Stiles. They can get really small. I almost got really stuck in one. (>.<) Not fun.