I found myself a bit bewildered, too, when I returned after a 30-year hiatus. Much has changed, and I do miss some things.
Algebraic, though, was an improvement for me. Visualization exercises were easier with a1-h8 instead of WQR-BKR diagonal, a-file instead of KR or QR file depending on what color I was playing.
<caution – somewhat off this topic, though related, so skip if you’re not interested>
Some things I miss, though. The old ticking clocks had a comforting sound. And I liked the depth of <40/60,20/30 --edited: actually 40/120,20/60 – they say the second thing to go at my age is the memory…> games with adjournments. Of course time scrambles are less of a problem with delay or increment, and tournament schedules are easier to keep. Many say the faster games (blitz, lightening) have made chess, if not more popular, at least kept it from being a lot less popular among those who don’t want to spend several hours on a game, and more interesting for spectators so I’m told. I can’t argue with that, but I still can’t help missing the old time controls and even the ceremony of the sealed move which has gone away (although it’s still in the rules) – I guess because I grew up with them.
I’ve updated my equipment. I have a nice folding board, as well as a nice tournament roll-up, good pieces, and a Chronos. I may even get a Monroi someday. There aren’t many tournaments or clubs in my area, but I will be attending what I can (maybe even try to start a club), as distant travel is still somewhat of a problem, what with my day job and other local responsibilities. I play online, which is new, and of course, correspondance hasn’t changed that much except for the use of email and the use of chess engines being allowed by some organizations (FICGS for one), and of course, chess databases for study are an immense improvement, but my trusty ECO’s (which didn’t exist when I started) are also well-thumbed, now (I like real books).
So, much has changed, some of which I miss, but the challenge and joy of learning are still there, and with online play now, the opportunities to play opponents all over the world are much greater, now. Change isn’t always bad.