Not having seen a lot of the ideas in the thread, so apologies if this has been mentioned:
To address the issue of "why don't martials do these maneuvers all the time?"...make the resource for those maneuvers hit points.
Since hp represent more than just meat, and they are also a measure of the character's vitality overall, make them what gets spent when pulling off a maneuver.
So, the fighter can use, say, "Whirlwind Strike" which is an attack that targets all opponents within reach and it costs X hit points. When the fighter is weakened (low on hp), she has a hard time pulling off that move. When she's at capacity, no problem. Higher level maneuvers would cost more hp and have greater effects.
A system like this seems to reflect what we see in action movies, comics, etc. It has a natural scale-ability to it, and as a bonus makes in-combat healing more important beyond whack-a-mole.
Like different casters have different lists, different martials would have different lists of maneuvers; maybe rogues have more debilitating effects, and barbarians break armour and knock prone. As well, for people who prefer simple warriors...no problem. Don't use the maneuvers and keep your hit points.
Frankly, I wish this is how sorcerers worked as well.