I have never been in a campaign that took place entirely in a dungeon. Even so, sometimes there are large rooms.Charger's something I'd expect to differ on a campaign by campaign basis. If you're in a dungeon 30 feet is a long way and you'll very seldom use it. If you're in the wilderness it's a lot more useful, especially with the object interaction rules or if you're sword & board making it hard to throw two javelins in a turn.
As a melee fighter, I wanted to get in close, not throw javelins. The attack bonus and damage would be a lot lower.