This is a great discussion, Jon!
Like others here, I must admit I have more lights than I can comfortable hold in my hands, but most of them see a healthy dose of use, since I rotate them as EDC or utility lights. I'm mostly in an urban environment these days, but my occupation does require that I spend considerable amounts of time out in the field from time to time. Under those conditions, we cannot afford not to abuse lights.
I'd also like to bring the distinction between the "constant" user (those who
must use a light because of their occupation demands it), the "occasional" user (those who choose to use and carry, but where having a light is useful but not necessarily critical), and the "recreational" user (aka. the fearless wall hunter). I'm sure there are loads of other profiles.
Years ago, I would've categorized myself as a constant user (living in a field reserach station), but these days I'm more of an occasional user (despite using my lights every night, I could still manage without them), or I make excuses to use lights (look, ma, another category!).
I'll be the first one to admit I've ranted about white beams, matching finish and donut holes, but in reality I wish more people actually worried about how a light might help them accomplish a task rather than having the latest UI, with the whitest beam, caring about the finish, etc. It took a while for me to interiorise this, but lights truly are "just lights"; they are tools meant to be used...
I do understand why people would want to baby their lights (after all: "you just paid how much for that thing?"), but sometimes it just gets ridiculous. Buying a light just for the sake of owning it is a waste, IMO.