I'm sure that's right in many cases, Pete. I often find that the best way to correct a sentence with loads of commas is not just to simply take them out, but to do some major surgery on the whole sentence - a full reconstruction is not unknown!
Sometimes, though, it's literally a case of writing just as I think, with a comma inserted every time my mental 'voice' has to pause. This usually results in one of three outcomes at re-reading time:
a. I leave it alone. (Hey, if I needed to breathe there, then I'm sure others will too!)
b. I take out a few commas but leave the sentence the same. (
Breathe? Pah! Who needs to breathe?)
c. I change the one long, comma-filled sentence into two or, very occasionally, more shorter ones. (Best of both worlds, probably. There's breathing, but not too much of it!)