In my experience over the last 12 months of GMing, it seems Critical Hits don't really seem to cause my players any bother after an encounter.
With a Colonist Doctor in the group, rolling 3Y on Medicine, she has no problems healing all the Crits the group takes. And since my campaigns has them traveling long distances, they (reasonably) argue that she can try again a week later if she happens to miss one.
Am I missing something?