Mine ain't.
This is assuming that you literally place every button down. There are still outlier moments where I'd want access to Fluid and Repose (despite the fact that I haven't pressed one of them since Heavensward, and the other is barely even niche). Meanwhile, I have equal (or less) buttons on MCH, DRG, BRD, DNC, DRK, WAR, RDM, etc. I know, I know, the point is less about button counting and more the fact that us WHM's are not exactly drowning in buttons to worry about, but really, MCH has a literal graveyard full of empty hotbar slots by comparison. It's not fair to say ours is empty unless you're literally stripping fat from the bone.
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As for the actual topic, I'm one of those few people who miss Cleric Stance.
As such, I'm all in favour of damage combinations and/or extra buttons. The fact it devolves into spamming a single-target button or AoE button 90% of the time can surely be expanded in a simple but meaningful way.