I agree thoroughly! You don't have to go Gonzo on trash patrol, but you can make a big difference. Even if you've got a small grocery bag on board or on your hip and only throw away what you come across as you're normally fishing without going out of your way, it will make a big difference.
Tight lines,
Wade

PS: If picking up someone elses trash seems like something that isn't for you, just vow to yourself not to let your trash become litter.