It infuriates me greatly when I'm in a queue of cars and the person in front of me is creeping forward everrr sooo sllowwwllyy leaving a huge gap... Just pull up to the sodding car in front of you and stop!
The situation in the OP is less annoying, as I'll just start moving when the traffic dictates.
I don't drive super slow but I will leave a gap and drive slowly if I think the conditions are right, it helps to smooth out the flow of traffic. It's pointless hammering it as fast as you can only to slam the brakes on and cause a domino effect. If everyone left a gap and drove with logic I reckon 60% (internet value) of traffic would no longer exist.
I've done this at the same time as other cars and it genuinely prevented a pointless queue. A unicorn moment.