You might give it another chance (or a few more chances). Actually, once you're clipped in, you can accelerate much quicker than you can on a flat pedal with no toe clip - standing starts are the one situation where you're indisputably pulling up on the pedals as well as pushing down. (I ride a roadie with Look pedals and a commuter with flat pedals and street shoes, and I've ridden each of them a few hundred times through any given stoplight or stop sign within about a 5-7 mile radius, so I have the opportunity to contrast them.)
There's a learning curve to learning to clip in without hesitation or having to look at the pedal, but if you give it time, you will find you get off the stoplights much quicker.