Insulin is a bit more of a double edged sword than that. Insulin causes the body to absorb glucose, if it is absorbed into muscle cells you have glycogenesis aka more glycogen stores in the muscles (more energy available for work now). If it gets absorbed into fat cells it will undergo lipogenesis turning into fat (more energy for the future). The liver has the ability to both create fat and glycogen.
Insulin is considered the master anabolic hormone, it also plays a key role in protein synthesis (the reason why bodybuilders take it).
Assuming you are not constantly spiking insulin, you can consume high glycemic index foods around your workouts it can increase your muscular gains substantially by shuttling nutrients to your muscles.
As for appetite control, fibrous carbs help and make you poop better. Another helpful tip is don't eat like its a job eat like its a hobby take your time, chew more. If you can consume a pound of broccoli and be hungry with the 200 calories you just consumed I am very impressed.