Have you ever botched taxi instructions? I cannot count how many times I have made this mistake. The most prominent one I can remember was at Seattle (KSEA) in a King Air many years back. I called ground, proceeded to butcher the response call, and, because it’s a Class B airport, I advertised to the world I was an amateur.
Checklists are great, but consider this: can you locate all of the circuit breakers mentioned in the procedures in less than five seconds? Why not? It’s a bad idea to hunt for circuit breakers during an abnormal situation.
VFR pilots operate in the same airspace as commercial IFR jet aircraft without having to ever hit the push-to-talk button. Most of the time things go just fine and the two operate without running into each other. Not having a requirement to talk to anyone doesn’t alleviate your responsibility as a small airplane driver to understand the airspace around you, though.