Things I like about healing surges:
- Reduce dependence on heal-bot spellcasters or ubiquitous CLW wands.
- Allow the party to forge on through the adventure.
Things I don't like about healing surges:
- Not very believable in many cases.
- Greatly reduces lasting effects of combat.
If the PCs get in an extremely hard fight and get licked, I want them to
feel it. If you have been knocked to the brink of death several times by a dragon 10 times your size, you're not going to take a 5 minute breather and sprint off to fight the dragon's brother.
Of course, any sort of lasting effect can also be nullified by clerics and others. So there's not really too much difference between having healers and healing surges except the healers are much more believable to me.
There's still room for the bad ass warrior who can spring back to his feet after getting crushed by a boulder, however that should be a specific option for specific characters.