I think it's really relevant if you have children or not OP.
I have toddler twins. I get zero downtime. If we want to go out, it takes a lot of planning and a lot of expense for a babysitter. It happens rarely.
My childless friends would absolutely drive to me - not because parents are entitled to special treatment, but because they have the decency to grant me the opportunity to actually get ready once I've put the children to bed, rather than have to pay for someone to look after the children whilst I get ready, in order to drive to them instead. It makes a big difference.
If I were to have a friend suggest dinner, and they drove 2hrs to me, they would leave at 5.30pm, arrive at 7.30. I've got the children safely to bed and had an hour or so to wind down and get ready and look forward to the evening. We would take a taxi 20 minutes to a restaurant, few drinks after and then we'd be home by 11, and I'm relieving the babysitter (lets say 4hrs, £10phr...£40) and home ready to sleep and look after children in the morning. Friend gets home at 1am.
If I had to meet her, even half way I would need to leave at 6.30pm. In order to do that someone else would need to put the children to bed and I would need to get ready from say 5.30pm. Babysitter arrives at 5.30pm. I slope off to get ready, and children most likely play up with a different, new person attempting to put them to bed) so I'm harrassed, stressed and trying to get out of the door by half 6 with one shoe half on and applying lippy. Hours drive there, and very aware that should anything happen, I'm at least an hour away, so I'm less relaxed. Meet friend, same thing, dinner, few drinks after, then it's the hour drive home, so I'm returning more like 12am. Pay the babysitter (6.5 hours this time, so £65), I'm getting to sleep more like 1am. Then wake up to looking after the children around 6.30am. All of this, in order for my friend to leave at 6.30pm instead of 5.30pm? None of my friend's would be that uncaring.
Technically is it "equal" travel time on the first scenario? No. Would any of my friends be that much of an arse to make me go through scenario 2 with all those extra hassles because their priority was to make sure they got to do an equal car journey? Also, no.