I sort of disagree on Photoshop, most of the love for Photoshop seems to be just lock in to its existing work flow. I have not used Photoshop before using gimp, and for my use cases Gimps multiple window interface seemed to me the more usable interface.
Due to the subscription model, the UI is getting actively WORSE as well. You have to push new features to justify a subscription, and most of those seem to be taking the form of useless UI clutter and cruft. There hasn't been a truly valuable new feature in PS since around the CS2 days IMO.
Photoshop's UI is nothing great.