I don't buy knives because they're popular, I don't buy knives because they're cool, (although if my knife is cool aside for the reason I bought it, than it's a plus. The only knife I ever bought for the gimmicks was an Victorinox Swiss Champion Plus SAK but I've never gotten tired of it.
My one hand opener knives are either hole, lug, flipper, stud, assisted or auto. Nothing I get tired of, all the knife features, such as multi blade, locks or materials are also purpose driven so again I don't get tired of them.
Personally because my knives are rarely impulse buys, being on a fixed income I'm very aware of my available knife funds which is why I buy more traditional style knives these days. I can get them cheaper overall, made with premium materials by skilled craftsman. Add to that the knives are usually 40-100+ years old yet still are as good as the day they were made except they have a history and show signs of use.
I've had all the new knives as they came out, I've been collecting and using for a long time, 40+ years. I saw the introduction of Spyderco's first knife and they're subsequent collaboration knives, I bought these not for the gimmicks but because I researched them, held them in my hands and if someone I knew had one, I'd ask if I could use it to check it out. So my purchases were always educated.
Heck, I didn't get a Sebenza till 25 years after they were introduced. I didn't get it because everyone else has them and I won't tire of the quality, F&F or design, I'll be using this knife till I die, as I do with all my knives...
I'd be lying if I didn't say I have any gimmicky knives as I have a few, Colonial Trick/Magic knife, a few Funny Folders and 1or2 knives like a Rollox and a Benchmark SOS that'll never get used so I'll never tire of their features because they're two of my very few safe queens.
If we buy more of what we need based on the task it's intended use we'll find we don't get bored with our knives. Try collecting vintage traditional patterns, there so much variety, so much history and so much price ranges you could down the next 50 years learning what there's available to learn.
Oh and just in case I didn't answer the OP's question, no I don't get sick of a feature, if it's engineered properly it should never make it's presence known until needed, if some correctly it should be unobtrusive unless that's it's function like glow in the dark scales.
