Maybe not the /all/new but I pretty much only visit /new on the subs I frequent. It's a much better way of using smaller subs from my perspective. Lots of things never make it fully to the front page of a smaller sub. The drawback is that subs which get caught in a filter appear to show sorted by their submission date and not the mod approval date so you can miss things on /new that might make it to /hot
This is the right answer. I do this too, because when everything is <10 votes with a few outliers, /new looks close to /hot, but there are more submissions. For subs where the front page changes not hourly, but weekly, it's the only way to get a little freshness.
Lots of people visit /new. They're called "knights of new". The total number of these people is probably far lower than the front page (where _hot is used), but it's how every submission gets its start.
Lots do. At least two reasons, I can thinks of,
1. If you are a regular to a sub, new will act like RSS feed. You know what to read and where to stop.
2. If you believe in reddit karma, better chance of your comments to be recognised. By the time it hits the front page, more or less it is a comment muddle.