If you know what you're doing and you'll remember you might like it. But if you're afraid that you'll brake something with that alias just don't use it or create another alias like
rsync-cp or whatever suits you (read discussion in comments).
Still this is the single most awesome tip I got some time ago from colleague
If you would like to have copy command with progress just use:
alias cp='rsync -p --progress'
--progress and add it when you need it.