I've been using circular needles for years and they just suit the way I knit. I also find they make your knitting more portable (easier to stuff into a travel or handbag than long straight needles) and I just prefer knitting in the round and not having to sew pieces together afterwards. It also means you can "knit" all the way, no need to purl - which makes knitting faster for me.
I convert patterns, like the one I'm knitting for my son now so that I can knit them in the round. It's not difficult really and raglan sleeves are well suited to it.
I was just happily knitting away with a new circular needle today and marvelling at how smooth and pleasant to use it was so I thought I'd make a blogpost about it. I also started work again on a pair of socks "toe-up-two-at-the-same-time" (first time using that method for me) which had been on the needle for quite some time. I discovered how much I enjoy knitting with the fine wood tips on the sock needle, they are very smooth and practically silent.
When working something smaller like a sleeve or a sock, you can either use a longer cable length and work using the "magic loop" method (not the same "magic loop" as used in tatting!) or you can use two circular needles. The advantage I have found with using two needles is that when you start the next round, your first stitch can be tightened against the needle you are no longer using, instead of having to tighten it against the cable (if using only one needle). Tightening against the cable means your first stitch is a bit tighter than the others and you have to fiddle a bit to push it back onto the needle when you swap sides. So now I'm using two circulars to complete the sleeve and it's working really well. Nearly done.
Once you have made the first couple of stitches,
you can pull on the needle not in use and let it dangle until you need it again.
I'm enjoying my "knitting phase" at the moment. Especially as I'm getting more and more used to my new way of knitting.
How about you? Are you a fan of circulars? Or do you prefer straights? Short ones or long ones?