Glory holes are anything but a thing of the past in New York, and there are some marvelous ones (you'll never get the name of the best one out of me, you guys who are into this--this is MY club and I get a lot of the best dick that goes in there). Those like blokeboy has linked are the old-fashioned type and they are the ones that seem dangerous. The newer ones are much more liberated, you still have everything framing the basket (it's a HUGE rectangle hole), but you can look up and see beforehand (and usually you go into two separate booths together and see anyway, otherwise the glory holes I use have easy access views, and you can choose your partner and THEN narrow the focus down to Cock Worship.)
I would personally never use the round wooden glory holes as in blokeboy's pictures, meaning I'd never shove my dick through, although I did once suck a cock through one of those, but very briefly; I'd seen him, he was good-looking, but a few minutes was enougyh.. The ones in all the best Chelsea places are big enough to check the guy out even if you didn't enter at the same time. They are also big enough to get both arms through to hug the guys' ass, fingerfuck him while you're sucking him, etc. Yesterday I let a Chinese guy fondle and frig me for a long time through one of these, then I jacked a gorgeous cock reaching a couple of feet with both hands to jack him. And for that euphoric feeling of a huge cock coming in on you, these are a thousand times better, you can see the legs and feel the ass while you are sucking and I have been sucked a good number of times through these; although only once as well as I have by another guy who I know well at a club and we go off together and make love in form of him worshipping my dick and some kissing in between, which I never do at glory holes.
Also, there is often a button that will allow you to raise the window and completely see each other. I think these are a remainder from the Giuliani years when there were no glory holes and you only watched each other jerking off (that was sooooooo drear.) But the buttons are still there, so combined with these huge glory holes--which are big rectangles about 2 feet long and about 10 inches wide--you can be anonymous or not, depending on the ones fucking and sucking. These particular glory holes are even big enough to assfuck through. I never have, although a while back a kid shoved his ass on my dick, and tried to force me to fuck him, which was a little strange. Most of the time guys don't ask for raising the window, but the Monster I sucked last Wednesday did ask me to raise the window so he could enjoy seeing me groan with pleasure over his fat dick, even though it was just too big to get the sucking perfect--however it was a well-spend half hour of struggle. I could do a lot more hard work of that sort. Fuckin' bliss, yeah.
Personally, I probably prefer to be able to control the position more when I'm getting sucked than even these glory holes allow, although it can really be a keen way of getting your focus on your own dick. But for sucking other guys, I LOVE these big glory holes--it's romantic, there's no danger because you can check the guy out and vice-versa, but you can really get down to business, and it can be beautiful. I didn't really get into to it until the last few months, now I absolutely adore this means of worshipping a huge cock.