Most of the time I turn off all traffic, AI and Real, because often there are so many flights on frequency that it is difficult time-wise to transmit. Whenever someone else is transmitting, ATC responses are grayed out. As soon as someone is finished, I mash #1 hoping to transmit first. And it is VERY annoying trying to change frequencies but I can’t because the number is grayed out until someone stops talking.
The issue may not be the “limited” capacity of ATC because large airports have multiple frequencies to manage workload, but rather each person’s ability to fly correctly in heavy traffic. And flying VFR in heavy traffic areas is crazy when ATC is issuing traffic advisories two or three at a time.