We just got home last night from our stay which was from Sunday to Friday. We went to the parks every day except for Monday. The crowds were truly minimal, and seemed to dwindle as the week progressed. The longest wait we had was approximately 15 minutes for rides/etc such as Philharmagic (midday yesterday), Tomorrrowland Speedway (mid morning yesterday) and Rock N Rollercoaster (during EMH on Thursday night afer Fastasmic, approximately 8pm). Stich had a 25 minute wait posted later afternoon on Tuesday, but we didnt do it. There were several rides that did not even offer fast pass as the standby line was so short, and they did not offer child swap as well often since the lines were so short. We did EMH yesterday morning and rode Buzz Lightyear 3 times in a row starting at about 830. In fact, we did EMH on Sunday night at AK, Tuesday morning at MGM, Tuesday night at MK, Weds evening at Epcot, and Friday morning at MK, and the waits were practically nonexistant. Even though several rides had times posted for a 10-15 minute wait, it was far less than that. There were even some that had 0 minute wait times posted, even after morning EMH was over. We rode the safari on Weds at about 930 am with about a 5 minute wait. What else can I say? All in all, it was very relaxing to have so few crowds, not only in regard to the limited waiting in line, but we were able to get around very easily with 2 strollers without having to fight the masses, and we got several pictures with very few people in the background. Oh, also, although we had some priority seating reservations made well in advance, we would walk up to the counter at other times to make a reservation later in the day and get the time we wanted (for example, we made a 550 PS at Brown Derby for 6 people at 3:45 that day, and were able to eat dinner and get over to Fantasmic at about 6:50, and got seats about 10 rows back in the Witch section, and yesterday, got a 12 noon seating at Liberty Tree tavern when I walked up to the hostess counter at 10:30 when they opened).
Hope you experience the same!