I USE timers, but 99% of them I ignore after like 5-10 pulls. On our Azshara prog the only timer I remotely pay attention to is when bombs are soon-ish so I remember to move my imp. Everything in like phase 1 though? It is so scripted that I don’t look at timers at all because I know after I do my opener and shoot 2 shadowbolts and refresh dots the hulk spawns. Then a beam. Then some soaks at which point the bosses move in LoS of each other. Etc. Etc.
Chances are I will eventually stop looking for bomb timers, but we spent too many nights not getting that far it is still a somewhat “fresh” mechanic.