For the most part I don’t use conscious reference marks, mostly just feel as to when to brake, turn, etc. However in the sim I use braking markers a lot more as I don’t have the feel as in the real world. I’m the better part of 25 years (some breaks at various times) deep in racing.
I think early on I did, but now if someone asks where I brake I can’t tell them because I don’t know. If I focus on it while on track I can pick up where I am to help someone but in general I have no idea.