The construction is getting closer to completion...within the last month, JetBlue finally opened about 10 gazillion counter positions on the left side of the departure terminal (opposite the food court). That alleviates the nasty lines that used to block the doorway entrances and makes room for new Air Emirates (and I believe a few more Cape Air) check in positions.

Of course, why they couldn't add a lower level tunnel to seamlessly move from arrival gate to baggage claim/taxi, is beyond me (since you still have to traverse the departures area). And no, the 40s gates for Alaska and Sun Country are still separated from the rest of the terminal. Which is a real pita, as there is no PreCheck nor place to buy a decent cup of coffee, post security, before flights to the West Coast

I fly out of A and C quite often, and you certainly don't need to be there more than your normal 60 minutes. If there is a traffic backup to get to C (rare, but it does happen), just alight at Terminal A and walk.