You're making things really hard for yourself when you insist on playing healer spec while refusing to group with anyone for instanced content. Just because running solo is an option it doesn't mean you're free from having to adapt to what you encounter like everyone else. Putting a timer on things is just an easy way for designers to avoid dps-check-walls while still making challenging content. Play what you like, you do you.
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Not everyone has this intricate knowledge of the visions nor run with addons to let them know and keep track of all the internal timers for stuff to look out for and be mindful of while clearing them.