If the band is busy, it's busy. The tones just make the situation worse. You need to be able to hear if anyone else is on freq IMO.
And.. not directed at you or HAMs, but in general....Just hang around moab to hear how bad GMRS users can be when they pay no mind and blast tx. It is getting worse as Midland floods the market with 50 watt radios to consumers who don't understand that they shouldn't blast 50w just because they can. tx power does mean you can receive anything any better. (so, please turn down your power to minimum required for your use case)
I think that is one benefit of HAM, is you at least go through a very minimal amount of reading and training that hopefully gets some basic sense of what being a good citizen on the bands means.
A bit on the same topic, but radio quality and antenna setup makes a massive difference (as well as band.. i mean 2 meter is going to do better than 70 cm/gmrs) If half the crew is using a baofeng inside a metal box, then the one guy with a 50w midland isn't doing anything all that great for you. (And I do like that baofeng at least help get people into ham, but they should move on to a better quality radio asap, because HAM can be SO much more than what a uv5r can give you).
Ham really can teach you how little power is needed to make contacts.