What do you mean you only use Aquaveil on yourself? Don't sit on your tools when they could benefit your allies, and most of the time it's gonna be the melees ahead that'd beg for one more trump card vs crowd control. Aquaveil also comes with a barrier which can save lives.
Similarly, hardcasting Cure II can also be the difference between life and death for someone trying to retreat without dying.

@Amiable: On the comparison between luigi's mansion first boss and pvp crowd control, I do understand the analogy in that both can feel infuriating for the victim in terms of loss of agency. I also acknowledge that both eventually result from the player failing at something: in strayborough, it's failing at the DDR, and in pvp, it's failing at playing cautiously when purify or other tools are on cooldown or when being forced on point when the team is losing with no means of tempo.
I am definitely fonder of softer crowd control like bind/heavy or the old half asleep. I wish we had less hard stuns in pvp, but I guess I do acknowledge that crowd control is an inherent part of the core of pvp with interesting mechanics, where in luigi's it's just DDR. I'm much fonder when the action/reaction is inverted like in pvp where not only you can predict or plan for, but also react to, the latter not being the case in luigi's. And I'm saying that as someone that would LOVE crowd control to become a big part of pve, much like in pvp.