Seriously, I tend to say 'seriously' quite a bit. To my defense, I believe it's because I do tend to joke a lot and feel the need to alert my friends of a 'serious moment' in my otherwise silliness.
That said (or typed, rather), life is too short to take trivial stuff too seriously. I admit many words and phrases make me cringe BUT the older I get, the more I realize how silly it is to let those things bother me. Unless the language is obscene and/or meant to offend, the 'problem' lies within myself rather than the speaker. Goodness knows my own language isn't perfect and I've yet to meet anyone, whose language is. Unfortunately, we tend to overlook our own faults, while noticing what others say and do.
