Not quite. For one thing, Insulin is an extremely important protector against yourself. If you didn't have Insulin to kick in when you - knowingly or not - got your blood sugar up to dangerous levels, you probably wouldn't live very long. Secondly, it IS highly anabolic, and is one of the key factors determining your muscle growth. In this case you're getting some of the bad with the good - you gain overall weight, as in some muscle, some fat. This is one of the reasons it's practically impossible to gain muscle and lose fat at the same time (other factors play in as well, as there simply being too little calories available to allow for muscle growth, for example).
Moderate Insulin-levels are beneficial for muscle growth, as long as you don't go overboard. Stick with pasta, rice, potatoes, oatmeal, and other classic bodybuilding sources of carbs, and you'll probably hit the mark pretty well.
You may have noticed that I use fairly negative terms about the insulin force-feeding the muscles with sugar. This is on purpose, simply because it is not a really nice thing to do. I like to compare it to blowing air into lungs that are already full. How would you like that?
Now, the risk here is that the receptors in the muscles, the little dude who listens for the Insulin knocking on the door, decides that the Insulin has been knocking just a little bit too frequently lately, and decides not to open the door as much as it used to. After all, the muscle is not a happy camper about the whole thing in the first place. This is not a concern to the insulin-regulation though, as the primary goal is to get rid of the dangerous sugar from the blood. So in order to get the job done, more insulin is released to reinforce the effect. This, in turn, makes the receptors even more numb, and down the spiral you go. If you keep abusing your body like this, you might end up with Type II diabetes, where the receptors simply not longer cares about the insulin knocking on the door. The bad news is that decreased insulin sensitivity in the muscles doesn't necessarily mean decreased fat storage capacity (which can be kinda nasty if you have truckloads of insulin floating around).
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