Yeah that has been pretty much my experience as well.
Mine also when I close Oculus it just minimizes to the system tray... I have to remember to close with the system tray icon so that it switches back to balanced power mode, otherwise the CPU will be stuck at 5GHz wasting all those precious electrons....
Ha, I just leave my conservatively overclocked i9 9900k (water cooled) at 5Ghz (all cores) with a high performance power plan, dam the expense (probably a few $'s per year)!
The main energy usage comes when playing 3D/VR games/sims which loads up the cpu (and gpu) utalisations and you can see the temps go up (= higher energy demand). My temps never go above 75degC and drop to 30degC very quickly once the games/sims exit and I go back to low usage apps like MS Office and web surfing.
Well for some strange reason, the behavior of my Oculus Home just minimizing to tray when I would close it, has stopped and now it closes properly for me as of yesterday I think.