i've tried pump it up and ddr a couple of times but i never really got hooked on them in the same way i got hooked on keyboard-centric games like osu!mania or Quaver. the differing playstyle just feels like a gimmick and heavily limits the kinds of charts can play. forget about chordjack, handstream or vibro. on top of that, the relative inaccessibility (my nearest arcade is over 4 kilometers away and i don't have a car or much money to burn on arcade credit) makes it harder for me to get into too and really makes me question how dedicated players can afford to practice for hours a day.
Of course you didn't see any spectacular charting, if you play it a couple of times you probably didn't go higher than a 10, and I think above that is when charts really become interesting. Before that they go easy on the concepts and note density.
You are right there are no chordjacks, handstreams, or vibros... because we have different terms. They are respectively called jumpstreams, streams, and as for vibro correct me if I'm wrong but that's where you vibrate your hands or fingers or whatever? We sort of have that in drills and trills.
In osu!mania though you technically have more possible note configurations, you have constant access to the inputs. In DDR, you have two legs and four pads, or if you are a doubles player like me, two legs and eight pads, plus the limitation that you typically alternate your legs if you don't want to look like a jackass. These limitations have fascinating consequences and give rise to many patterns, which would be no problem in osu!mania but present a challenge in DDR. There's candles, crossovers, the afronova, 270, spins, trills, jacks, drills, grace notes, gallops, double-steps... just off the top of my head. Many of these exist in osu!mania of course, but it doesn't have the same implication as it does in DDR because of the physical movement. If you don't think through your stepping properly, you can end up in an awkward spot or get all twisted up. This list doesn't accurately capture the breadth of patterns and their challenges, but they are some of the common ones. Note that in doubles, the variations of patterns that exist are exponentially more massive, you would struggle to give a name to every distinct pattern.
Check out
this video of CowEye playing 'Rush E' which demonstrates a handful of patterns like drills, crossovers, a 270, afronovas, as well as 'hands' which are not in DDR but are possible nonetheless. This video doesn't come close to demonstrating what is possible in a DDR chart.
Sure, DDR charts could never reach the speed and note density of even a regular osu!mania map, but the limitations of the input medium make it a far more complex rhythm game in a different way.
In conclusion, don't talk shit about shit you don't know.
There's an arcade next to my university. I was making decent money last year so could go often, these days I'm saving up to buy a car and I have less time to play, but I make sure to go at least two, maybe three times a week, to keep fit. I usually play 3-4 games which is at least 9-12 songs. I always make my games intense. Dedicated players often end up buying their own pad for a few hundred to play at home, which I would rather do if I had the space.