I feel ya a bit. I stopped playing Warrior back in HW as well when Str tanking started to become required. Without getting into that much, it's still the major way Warrior is played. Not much has changed with the base rotation, and as Faeon mentions we have a Beast Gauge for Inner Beast/Fell Cleave/Upheaval/Onslaught now instead of the old wrath/abandon stack formula. As for stance swapping, it's still kind of a thing. High end Wars mostly tank in Deliverance for an entire fight, but War is capable of very nice mitigation and damage due to the fluidity of changing stances compared to the other tanks, so it's certainly something you should be comfortable with if you want to play War optimally. I'll admit it took a while for this style to grow on me, but after leveling all 3 tanks, War is by far the best at it.

As for ease of play, I don't know, I guess it's easier after the recent IR change (doesn't feel much different to me honestly). Difficulty is different for different people. Paladin supposedly has a braindead easy rotation too, but because I never played Pld much during HW I never got used to the 3 combos (most of my time on Pld was during ARR) even though it's basically the same as the 3 War combos. Throw in the switching between physical and holy spirit spam and it's nothing but a big ol bowl of spaghetti for me lol