I agree completely on this. I really, really wish you'd actually abandon using the IE rendering engine for MC. WebKit or Gecko (Safari/Chrome or Firefox) would be so much better for a ton of things. However, assuming that you are still using the IE engine, IE7 has a reasonably-well implemented full-page zoom feature. It isn't quite as nice as the Firefox full-page zoom, but it works fairly well.
Could we get access to this, at least? It'd be particularly useful with the new links feature in MC13 (and for buying things from the Amazon store)!
It'd be even better if there was some way you could have it "save" the zoom level on a per-website basis. That's how Firefox works and it is beautiful.