I use a blowoff, many of my beers would have made HUGE messes without it and I think I will always use one just for safety measures.
I leave it on until I go to secondary, and see no need for a bubbler. I've never had suckback, but I use a large arc on my tube that would take a great deal to suckback on. Largest temp drop for me has been from 84F down to 65F.
It's less hassle to leave it alone too (nice plus), but the downside is you don't get to watch the nice little bubbler
I do use a bubbler if I make a cider and then I can get my kicks watching a bubbler if I have the urge.