I don't find it that bad honestly. I think you have to know when to disable it and when to leave it enabled. If I was in a start stop situations with long stops I would use it. If it was really quick stops then I would disable it. Guess that's why they have a button since life isn't the same always
If in a combination situation then all you do to have it ready to go is to not wait to release the brake only when you go for the gas. If you're at a stop and ease off the brake just a little before fully letting go of it for the gas it's restarts and is ready to go. Try it. Just ease off pushing all the way down as you would, the vehicle restarts and you're still not moving at all then you go for the gas as you would normally.
Also mine restarts instantly ..no shudder ..no noise..can barely hear it. I'm not saying you can't feel a restart ..but it's so quiet and quick it doesn't bother me (keep in mind i'm using a gas powered 35i...maybe other engines don't act exactly the same)