I used to be a fan of Zebra Sarasa (retractable, not one of the variations) which I thought was better than the G2, but it wasn't always reliable (maybe they changed something), was more expensive, hard to find in stores (G2 are everywhere though), and accumulates a glob of ink when you draw a line across the page, which ends up wherever you next write something. I happen to have a G2 next to me so I'm testing it for the same problem now, and ended up with a glob somewhere along the long line. I cross things off of todo lists a lot or draw dividers between sections of the page so that happens all the time. Still, it might be a good compromise for the pressure issue for writing sentences.
Not that I'm that price sensitive, it is kind of nice: Sarasa ($2+ each, if you can find it), G2 (~1.25 each), Cristal ($0.10-$0.25 each)
The G2 definitely does glob. That's one of its bigger faults. (Others being that I, personally, prefer a line width between the 05 and 07 options -- obviously this is world-stoppingly critically important -- and that really old ones, I mean really old, tend to get disgusting sticky grips.)
Mostly they're just nice for being fairly rugged and reliable in a way most nicer pens just aren't, for carrying loads of ink, and for being ubiquitous. They're far from perfect. They're just... Good Enough™. And that's good enough!