I've never had any issue at WDW either. I keep thinking that I must have missed the "bad years". I did not visit between 2010-2014..so maybe there were more issues during those times?
I try to stay within the Hilton portfolio as much as possible, but have stayed within the Marriott brand and never hand any problem there either.
One thing I wish that Disney would do is become a little more energy efficient. Do we really need all new towels everyday, and sheets changed daily?
Hilton hotels are great about Sustainability, from Waldorf to a Garden Inn.
We stayed at a Homewood Suites (been a while since I've stayed at one) over NYE this year. The hotel is just over a year old and I was extremely impressed with how energy efficient it was, around the entire hotel, not just the rooms. All led lights, reminders to turn them off, maid service and linen/towel change by request- or every other day, HE appliances, low-flow faucets and toilets, etc.
Waldorf's still change linens daily, unless requested..or at least they did in 2015. I requested every other day. They straightened our beds, turn down in the evening, but I don't see the reason to receive new sheets daily.
Maybe Disney will implement some of this with the new training. It would make a huge difference.