Is this stuff hard or just a curiosity?

It is a bit of both really- not that it takes much skill (I did most of these jumps within 10 mins) but some of them are definitely harder. The judas jump to sg cubby and d5m1 to armor window were probably the hardest. But- its kind of an unexplored world. You will see some vanilla rj's in Doom II speedruns but thats about it. The jumps on d2m1 have been known about for a while now, as well as the d5m1 jump to plasma. Other than that these are all new

NS rocket jumping with mouselook has been fairly popular tho
https://www.youtube.com/watch?v=zffPiUC0wh0 lol