I'd say that's more the case with their competitors. I really think that with Monsters Inc especially, it was them knowing Disney was going to make a series of cheapquels and they thought "Did someone ask for a challenge!?!?!" And I give them credit for giving most of their sequels a good, long time in between. Other than TS2 and Cars 2, it's not like they're directly followed a couple years later. Finding Dory was well over a decade since the original, ditto Monsters U and TS3. Then of course, they get equal crap for their other original films not being as good as the preceding either. It's like they're only allowed to make one kind of film, and then they get crap for them being formulaic. Just like Disney and the Princess films. They got crap for making them, then they got crap for doing things different.
Meanwhile, 5 Freaking Ice Age movies that get increasingly cartoony, some withing a couple years of each other. And a Rio sequel that I can't rightfully say no one wanted, but it was generally poorly received. Honestly, the first one was incredibly overrated and not really that good either. I can honestly see Disney pressuring Pixar to make more sequels, and it looks like it's the case when it isn't. I'd say by comparison Dreamworks is in and out of that sort of thing. I can't say they had a really bad sequel outside of Shrek 3 being repetitive and redundant. Sure, KFP2 was better than the third one, and I kinda blame the fact it had a TV show in between, making the villain conflict look like an extended episode, but still having that touching stuff in the middle about his lost Panda civilization. But then you look at some of their original films made since, and while nothing really looked that bad (the jury's out on Trolls, but even compared to what they were originally going to do, not as awful), they just seemed ...strange. Turbo seemed like a huge step backwards for them, Trolls too. It's unfair for both studios to be compared by their best films, as they're either going to not be as good or fall short, and exceptions beyond that are, at best, very high and basically just met.