As an anecdote, I have found that price comparisons are perfectly feasible in a non-emergency situation. My son broke his arm, and instead of just driving to the nearest emergency room, I called around to a handful of urgent-care clinics and found one that was able to quote me some prices that were reasonable, so we went there to get him treated. Easy.
In any case, I think the ACA is a train wreck, piling on more of the crap that makes our system suck: the disconnect between consumer and producer. If we ever want to make our healthcare market sane, we will have to largely cut out the middleman ("insurance"), and the only way to do that is have patients pay for their own care (particularly routine care).