Really. I consider it a sign of inexperience and an indicator that the admin has never had to clean up after someone else screwed something up as root. That may be the case if you are super meticulous and you've been the only admin everywhere you've been, but no serious environment only has one root level admin and I have yet to meet anyone who was really good and super meticulous all the time.
I'm doing sysadmin, maybe one out of 20 commands I type *have* to be run with root access. If I am doing them all as root then there is a much greater chance of making a mistake and committing that system destroying action or, even worse, doing something subtly bad that nobody knows about until later when it's too late. It also makes me think twice (instead of just once) before executing that command as sudo.
Sudo logs commands that were run, by whom, and when. Even if I didn't care about whether I was root all the time or not, having a log of what was done with that access can be an indispensable tool when doing system troubleshooting. It's also a handy way of telling if someone screwed something up or if j00 wuz pwndz.
To me, running around as root and not using sudo is like using vi to look at a config file you have no intention of editing or similar. It's too easy to slip up and do something wrong once you get "in the groove". Add a page at 4am to that or a situation where you're at the tail end of a 30 hour emergency maint and it's beyond easy to screw things up.