I did just switch Internet to save a whole $12/mo. That move wasn't really about savings more than it was about finally having ANY other provider but ComCast. I hate Comcast.
I also jumped to Sprint to get a no contract year of $3.50 per line unlimited data. (Its so weird to pay less than $4/mo per line, we're used to about $30/line) We have unlocked phones, so we actually jump around if we can save even $5/mo.
I've not been successful with any insurance or utility though.
I also ignore a lot of our other spending including grocery, alcohol, restaurants, or whatever. There's room for improvement to be sure.