...or that I've never cut a steerer too long.

If you already have a hacksaw and no pipe cutter (which I don't like personally, sloppy cuts IME), it's easy to fashion your own saw guide with a variety of stuff, hose clamps work great. (although I have a Park guide which works well on handlebars as well as steerer tubes...). Just be sure to cut square (again where pipe cutters tend to suck) and finish the rough edges with a file/sandpaper...