I absolutely hate this kind of healers who tries to 'push dps' at expense of more healing. Good healer is the one who keeps me alive and don't make me feel like I could die at any moment. Healer dps isn't really such a big deal. Now, if healer dps and:
1) any dd dies - now that's a big dps loss.
2) tank dies - possible wipe
I'd say big risk for... little bit of extra dps healer provides?
I'd rather have healer just heal and throw dps once in a while when it's really safe than recklessly pushing his dps and risking failing his job which is... KEEPING PARTY ALIVE!