Don't know about hotels - I wouldn't imagine they'd be cheap, but for other stuff, if you're used to Dublin prices, you won't find it expensive.
A couple of years ago, I was there and ended up parking in the car park under Casino Square. I wasn't too pleased, as I figured it would cost an arm and a leg. Turned out to be cheaper than parking in any of the car parks in Dublin.....
I'm sure you can pay silly money for stuff there in some places, but for normal things (lunch etc.) it's easy enough to pay less than Dublin prices for similar quality.