While I think Deans are "ok" for most applications, I also think they should be upgraded so they are around 50% larger in all dimensions.
But aside from that, those huge currents are only a problem on take-off or heavy acceleration from a slow speed. Normally, current levels are around 15A or less on average. So, I guess it depends on what kind of driving you do. If you do continual standing backflips where there are a lot more heavy current draws, then maybe a different connector is in order. If you are racing, you generally aren't as hard on the system (as far as burst current is concerned) because you try not to stop and go as much, and so Deans are more than adequate.
I personally don't like bullets for two reasons:
1) They are not polarized so accidental hookups to the ESC can be catastrophic. Yeah, You could put a male on one batt wire and a female on the other, but that leads to point #2.
2) Ease of shorting. Even properly insulated female bullets have a relatively large exposed area where a conductor could conceivably make contact. Not worth the risk.
I suppose you could do something like this to eliminate connector woes: