My vote: to each his own.

If you're queuing via the Dungeon Finder, don't expect a speed-run. There's a good chance that at least one of the people you're matched with will be a first-timer. If you really want to speed-run that badly, then form your own group and knock yourself out. The only problem with speed-running is when people join a random DF group and then start b**ching because the rest of the team is either undergeared or wants to stop and smell the roses.

Personally, I like to kill everything that's directly between me and the boss. On an average WP or AK run I can earn ~3k gil just from the mobs.