It is cheating if it gives you an unfair advantage over other teams, namely the ability to quickly build a bridge over to another island without falling. It is doing you good if you're able to build a bridge about twice as fast as a non speed-bridger. That is 100% cheating, and you could be banned for that. Just because your friends are also cheaters, doesn't mean it's ok for you to do it too.
Can You Speed-Bridge?

My time for turning it on and start building and turn it off is slower than people building casual bridges. The only advantage for our team is our teammates can go to mid faster. If they are dumb they will not protect the bed, and I straight losing.
That's an unfair advantage, and you can (and should) be banned for that.
I can do Breezily. And I need to turn it off after the bridge, making it not much better than breezily.
1. You cant' do breezily if you do it with autoclick. It's just cheating
2. Turn what off? You mean autoclick?
3. And why do you say "need"?
4. As for the last part, it doesn't make sense, at all