There has been no sweeping change across WoW specs that has reduced the actual button count of combat-related skills by more than a sixth or so at most, unless you want to hugely stretch that definition by counting each of the umpteen forms of "Track X" as combat related and as separate actions just because there was, for a time, no tracking button on one's mini-map.
They've trimmed RPG-skill bloat, brought it back (since one could just not bother putting in on their bars anyways), slightly de-clunked/unbloated rotations (no Jab for Monk, no Hemorrhage for Sub Rogue, etc.), only to usually refill those lost buttons with new ones, etc. I'm sitting on 12+ non-situational rotational buttons (Charge [which, yes, is a damage gain], Slam, Whirlwind, Execute, Mortal Strike, Cleave, Skullsplitter, Rend, Thunderclap, Colossus Smash, Avatar, Bladestorm) on a Warrior, a "zug-zug" class. (Yes, if using an at all hybrid build there, even the AoE (minus perhaps Thunderclap) skills see use also in ST due to their amp windows.)
That's... the highest it's ever been, unless including incompatible or wasteful actions like Shield Slam (can't use except when sword-and-board, which in turn prevented/nerfed-to-death your core DPS rotational skill[s]) or pre-Cata hybrid specs (which were generally quite poor).
Moreover, if we compare that against the likes of, say, SAM, you'd have count each combo action separately --despite their being non-separable actions-- in order to push over that --especially given that, unlike the spec above, its AoE has no place, not even in short windows, in ST combat. You have a hit-when-charged Shoha, up to 4 charges of Shinten/Senei, Gekko [combo], Kasha [combo], Yuki [combo], Meikyo, and Ikishoten, Iaijutsu [combo via TG], and Namikiri -- is just 10 rotational actions. We could push the envelope a bit there and somewhat consider Hagakure rotational since it's used for sync, but that still pushes us up only to parity -- 11 actual separate rotational actions. (And if counting TG separately, we should probably do the same for rotational uses of Heroic Leap for its reduced uptime costs on Charge, etc., etc.)
One has roughly ~24 buttons and the other ~30, but both have roughly the same number of actual separable rotational actions (and a good deal more meaningful utility --3 mobility tools, 2 external mitigation tools, 3 personal mitigation tools, 3 CC tools, etc.-- on the one with fewer buttons).