I never knew paint splatter from closing the can was a thing, because I was always careful about wiping the paint out of the gutter. It's a bit of a pain keeping the gutter clean though, so I took a .99 gamble on a spout and never looked back. The spout also does double duty for scraping extra paint off of a full brush.
The best paint related tip I ever got was that you can store your "dirty" brushes and rollers in a refrigerator for up to many weeks without them drying out. Just wrap them tightly in a plastic grocery store bag and they are good to go. Saves a lot of time and water for when your paint project lasts multiple days/weekends.