Old content also had non-linear maps. Sometimes there were multiple paths you could take and the dungeons didn't always have a 'kill this boss and the completion thingy pops' concept. So you just went in and went after some stuff, then left.
Multiple hour runs of places like Mauradon in WoW - was a very different era back then...
I miss it, but I also get why they dropped it. Many of the people playing back then are still playing - meaning they're 14 years older and have a lot more 'real life' to deal with...