Yes , very annoying saying I agree.

The one that pisses me off is "absolutely " used in a situation when a simple "yes " will do.

Are you going to the footy tonight - Absolutely!!
Did you pick up the kids from school - Absolutely !!
Would you like a cup of coffee - Absolutely!!

It sort of supposes that a simple yes is not a good enough answer and may be a bit ambiguous, and that your reply has to be absolute so that no one can be in any doubt as to its truth.
OR
The good old "To be completely honest with you " that people often use , because lets face it in past conversations we have had there have been times when I have been less than truthful with you. Always cracks me up that one, not surprising that its mostly used by politicians.