Helpful to certain extent. I would like to see, and that would give 5-stars rating, two more features: to be able to make permanent snoozes (a site that will show every morning at 7, the other that will show every Wed and Fri at 11 etc) and to be able to set my own default time (let's say 7 instead of 9).
Also, it would be helpful if we could see all the snoozed tabs, and unsnooze one if we want.