Yep, by default I just whack my follow key until they're all in range again, then a quick tap of the down arrow key (which simply makes them all take one step backwards in my setup).

If they've been scattered so far that they're out of follow mode then interact with target (with click-to-move enabled, as noted above) will do the trick - it has a much longer range than follow does.

At HH, a "strafe everybody" key will save you some healing too, unless you have your guys spread out anyway.