I don't know. Maybe it's me. I have been to Disney 5 times in the last about 6 years. People talk about what Disney has or has not done over the years. Maybe it's because I am not a WDW Expert who goes every year, but I don't see some of the issues that people point out.
Every time I go, I have to ride "It's a small world." Yeah, the music can get annoying, but it's still an enjoyable ride and I see something new in the display almost every time.
I don't see the constant state of dis-repair. Do I notice somethings are different? Sure. Last time I was there the POTC had some definite issues. (The projection on the fog, the cannon fire/explosions weren't working right) but that didn't stop us from riding it multiple times.
We have a local park here (Knoebels) which hasn't changed most of their rides in a LONG time. They do occasionally add one or replace another, but it's still very enjoyable. I don't need to go to a park (either locally or to WDW) and have it changed every time I go. I find it funny that as much as people want it to change, I hear just as many complaints from people that it DID change.
A good example. Malestrom in Epcot (I did like that ride and missed that it wasn't there last time) is being replaced (okay, maybe just a face lift) with Frozen. Oh the complaints on that.
So what is it? Do we replace or stay the same? There is only so much you can do with a car/boat/clam shell on a track. You can make it curve a different way, change it's speed, but ultimately a roller coaster is a roller coaster, what differentiates it is the theme.
My biggest complaint about any of them is the price. I might go more frequently if it wasn't so expensive, but I guess the bean counters have done the math to identify the "Ideal" costs of things to drain my wallet in as few trips as possible.