To the OP:
1.) No, I don’t think that UVHM is as challenging in TPS as it was in BL2.
2.) UVHM in BL2 was only really challenging when a toon was in the mid-50s to early-60s. By the time I had my siren or commando to L72, it was fairly straightforward. BL2 demanded slag, and tons of it, in UVHM. Not having slag available in TPS, I think they intentionally eased-up on the difficulty buff for UVHM. CRYO is a good choice, though. And stacking elements is always wise. Toss a Quasar into a crowd of scavs, then unload on them with a Frigidia (preferably with a Chronicler of Elpis COM, for max effect), and switch out to a Ravager or Spitter once they’re all frozen. You might actually expend LESS ammo that way, than you would in a straight-up firefight in Normal against a similar crowd.
Look, I SUCK at this game, like I did BL1 and BL2. I don’t find UVHM here nearly as challenging as I did in BL2, and it was still manageable for me even WITHOUT spamming the Bee. Hell, I did a whole start-to-finish run of the main quest line in OP8 with nothing but Moxxi gear (and best substitutes where there was no appropriate Moxxi gear, for instance for a shield or COM or relic). Drop into Sawtooth Cauldron in a Siren on OP8 with only a Rough Rider, LEgendary Siren COM, fire Bone of the Ancients, fire Kiss of Death, and fire Kitten. Spend not ONE second in FFYL, wreck massive amounts of face, loot at least 4 (maybe 5) LLMs, and make Brick proud. It’s so easy, a RAbbi could do it. Really.
UVHM isn’t all that hard in either case, as long as you know what you’re up to. With Gaige in BL2, I’d not recommend FotF for a shield, for one thing. It’s a better shield for Krieg. Hide of Terramorphous might be better, at least until you call out Deathtrap, after which I’d go with a Sham or Evolution or … well, something else. Maybe even an Antagonist, which is pretty easy to acquire.
Here in TPS, though, to directly answer the question, UVHM is simply NOT as challenging as in BL2. It’s still fairly rewarding, though.