"Totally" is far too American for me to use in such a manner. But I agree "100%" is ghastly, so concur with your sentiments herein.
It must be horrible getting to one's wedding day, only to discover they are the kind of person who says "100%" rather than "I do". Almost as soul-crushing as discovering your significant other is the kind of person who applauds when planes land. Yes, I'm judgemental as hell.