True. Right now I just delete it altogether, or don't use checkboxes in the first place. But I'm a speed/minimal effort standing between me and getting things done guy, and a real To Do app will do all this stuff for me and make rearranging tasks quicker and easier as well. This feature isn't make or break for Evernote as a whole, but would inspire me to do more actual task management within its environment.
But thank you for the tip! I didn't actually know the keyboard shortcut for strikethrough.