Looks similar to how mathematica works, there you also type \sum <tab> and it will transform into the mathematical sum symbol and guide you to what should be filled in next with empty boxes. Really cool that they managed do generalize this and make it available for developers.

I'm mostly worried about copy-paste becoming troublesome, one of the biggest advantages of text editing is that it's so raw and if you know your tools you can transform a lot of it quickly instead of being constrained to repetetive clicking through clunky wizards and menus with your mouse.