In a couple of earlier answers, I talked about the trains getting thrown off schedule during rush hour, especially late in the rush hour.
If you are waiting on the platform, and it's getting really crowded and you see from the message boards that there's a long wait for the next train, you can be pretty sure that train will be jammed with people who boarded at other crowded platforms.
A huge portion of the passengers will get off at a key station like L'Enfant Plaza, either because they work there or because they're transfering.
The odds are pretty good that several following trains are going to arrive very quickly and that they won't be anywhere near as crowded.
So the practical thing to do is wait for one of those trains.
That said, we need more eight-car trains at rush hour, we need more reliable equipment to avoid breakdowns, we need to get back to automatic control of the trains, and we need to operators to avoid suddenly closing doors on big crowds.
One further note about that: The operator in the lead of a group of bunched up trains is trying to get that train back on schedule. The longer the train spends in each of those stations with a big crowd, the harder it will be to get back on schedule.