We've been about 3 times for Breakfast. My Daughters now 8 and 11 both went through a "Princess Phase" - and there is NOTHING like going there when they are little and love the princesses.
When my youngest was about 3, she was SO excited to see Belle, that she slipped off her chair, bumped her chin on the table... was crying, and Belle reached out hugged and comforted her... it was amazing. Strangers were taking pictures.... Many magical moments in the castle. Even as a grown up it is a really cool atmosphere.
Probably not worth "killing" two credits - but if you want to save some cash - it would be worth it.