What makes you think they think you are going to go straight through from the left turn lane? They "freeze" because if you have a left turn arrow they don't. Maybe left turners opposite you will get an arrow at the same time you do, the lead car might hang back to see how wide you make your turn... no biggie. Better that than he clips you going through.

Personally I get as close to the intersection as possible. I'll wait behind the very first car but not directly behind. I'm always a little to the right. Even in fairly bike friendly Portland, if you are fifth person in line you are not going to make it through the intersection. The car behind you will be convinced that he could have made it if you weren't in his way. I've been screamed at, cussed out, horned, everything but hit, by drivers losing it as the signal times out. If I'm not in their way, its on them as to why they didn't make it through.