People have bow thrusters, a few have stern as well, and curiously enough those who use them are often less able than those without to moor up in a tight space because they rely on them and never learn proper boating skills. I have bow thrusters on my boat but the only time I use them is when I am sharing a lock and the wash at the end of the lock causes the bow of my boat to drift and get in the way if the boat entering the lock beside me.