Indeed. If you have fast, affordable, local E-6 processing, use it! If you don't, don't stop shooting E-6. Continue to shoot it and then send it out.
I don't live in a large metro area. My nearest E-6 lab is at least an hour and a half drive (Champaign, IL). I have no reason to drive to Champaign other than for E-6 processing. Much more convenient to drop it off somewhere and then pick it up in a couple weeks (actually if I drop it off on a Tuesday morning, it's back on Friday of the following week, so it's more like 10 days, not 2 weeks).