Are Islands of Adventure and Universal Studios in Orlando Plus-Sized Friendly?

I am going to these parks in Orlando in two weeks. I'm 5'5 and a size 28. I have particular interest in the Magical World of Harry Potter section, but am interested to know about other rides as well. I've read mixed reports that there are modified seats on the rides now, has anyone had any recent experience at these parks? I've never had an issue at Disney before, but did have a bad experience at Six Flags New Orleans when it was still around. I appreciate your response!