I get the overuse thing. Especially when you go into Guitar Center on a Saturday.
Hey now, just this weekend I was in the Fairfax Guitar Center and I was slapping a little on an SUB Sterling with too-high action... oh, whew, that was Sunday, not Saturday. I thought you were talking about me there for a sec. =0)
I slap a little but am not proficient (it is fun though!), and when testing a bass I generally only slap a couple of riffs, one of which I wrote for a song with a band 10 years ago. I *try* to stay away from Higher Ground, lest I get a Wayne's World Stairway To Heaven reaction =0).