Update from our trip this last weekend. The waits on Thursday and Friday with Express were 5 min waits for just about every attraction, include potter, hulk, spidey etc all day. Saturday and Sunday were way different stories! To give an idea of how busy the parks were, Fallon was holding guests in the downstairs lobby (two color wait) before sending upstairs for another 3 color wait. We waited about 20min with express for Mummy and Gringotts both with express. Still not bad since the stand by lines were 40 and 70 minutes respectively. Transformers express line was backed up to the entrance so we didn't ride. Kong and FJ were about 20 minute express waits with regular lines over 60 minutes each.
I know the parks are busier on weekends naturally but I was kind of confused why express waits drastically increased on the weekends. The hotels were full even Thursday and Friday so not sure the weekend had more hotel guests. Do lots of regular day guests purchase express?
Overall we were very pleased with express and will continue to stay at delux resorts for the 'free' perk!