After watching the ball move so freely since Harden's been hurt, I started wondering if there's a way to quantify heroballness and compare Harden's level to noted others. Sure enough, NBA.com's new nifty sports tracking provided the necessary evidence.
Passes per minute of possession (notable PGs): CP3 - 11.4, John Wall - 9.8, Ricky Rubio - 11.8
Frontcourt touches per pass (notable PGs): CP3 - 1.14, Wall - 1.17, Rubio - 0.98 (whoa!)
PPMP (notable wings): Lebron - 12.2, Carmelo - 12.4, Durant - 13.8, Harden - 9.2 (wtf!)
FTPP (notable wings): Lebron - 1.27, Carmelo - 1.35, Durant - 1.44, Harden - 1.46
PPMP is fairly self explanatory. Note that it's per minute of possession (with ball in hand), not per minute on the floor.
FTPP only applies to frontcourt touches because receiving the ball in the backcourt, say on an inbounds after a made basket, skews the data. Basically it measures how frequently someone shoots the ball after touching it (higher numbers indicating they shoot more, lower numbers indicating they shoot less and presumably pass more).
I chose PGs as comparison because I figured they naturally touch the ball more. I chose wings as a comparison because that's what Harden is, and selected players based upon their primacy on their teams, and because some (namely Carmelo) are noted for being ball hogs.
Doesn't look good for Harden, probably confirms a lot of what we suspected.