We just got back from this weekend too (well, Thurs-Mon) and other than Saturday, we thought the crowds were very manageable. Mornings were by far, the BEST time to go. We walked on many rides in the morning, often two or three times in a row. They let us ride BTMRR 3x before a line started forming on Sunday.
Even more shocking... we rode RSR THREE times in about 40 minutes Sunday night. I think it was a fluke because the board on Buena Vista said 60 minutes, we walked down there and their board said 15 and we walked right on! We finished, and ran right back, waiting 5 minutes, did it again after that, only waiting 10. By then, the Pixar parade crowd had broken up and filled it up again but it was an incredible experience. Even the CMs there said they have never seen it that quiet at that time of day. Only 2 hours before we had ridden it after waiting 80 minutes.
We made really good use of FP, which I think really helps. We pretty much always had one on hand. I don't think we ever waited standby for Space and road it at least 5x. Same with SOC.
Saturday was crazy though. Lineups for the big rides were 2 hours at the peak time (RSR and Space, etc). If that was one of your only days there, then I would have been a little frustrated too.
Hope next time is less crazy for you but honestly, it's pretty much always busy so you may need to modify what "quiet" means... it's like marking a term paper on a grade

.
ETA: We did see a few ride closures but we didn't find it too bad. I think we just expect it to happen so if it does, we moved on to the next and came back later. I remember SOC breaking a few times, and I heard others talking about RSR breaking down one day but I don't remember seeing any others. I think this is also just a fluke (wrong place at the wrong time). We were however, thrilled to see they opened Goofy's Sky School unexpectedly our last day there. Kids were SO excited to get this one in.