I was raised in the school of spurs and whip every ride. Now, I have exceptions (I do not carry a whip on Toby, unless on xc. He’s a bit whip phobic and the only times I’ve ever needed/used one was at ditchy things).
I use spurs every ride. I find that spurs are more I lateral finesse aid and less a forward aid. I have certainly used them as driving aids on lazy SOBs (as well as a whip- classic squeeze, spur, whip school), but beyond that I use them to get more lateral movement. A little tickle with a spur to get more bend or to encourage more sideways. Particularly with Toby, they pretty much stay off his side unless I need more sideways.
I did find that a longer spur was very beneficial to my jumping, particularly at prelim, when I need to create a powerful short stride (think coffin canter). My conformation can make that tough, and a bit more spur went miles to helping me get that done.