I had one, never liked it, never used it, ditched it.
Later I was doing a surf entry with a long surface swim. I was loaned one. I always hated them, never had one that was worth a crap. Always way too wet. Well this modern one was nice and would allow swimming into the waves crashing over my head and not filling the snorkel with water. Hey, a good one actually does exist. Gave the loaner back and bought one.
Since then, used it once. I'm not sure where it is right now. Did a snorkel to shore once. One time in maybe 4 years? And it was planned ahead of time.
Are they useful? In the right situation, yes. All the time, no. Personally, most of the time it is no.
I presume the training still includes a snorkel these days. As a newly certified diver I would lean toward keeping it for a little bit. When you do a dive consider if it was useful, or could have been useful. After a bit of diving you can make your own decision if it is a benefit or not. There is no universal answer, but a lot around here will go without.