Yep, or just clamps and plates, by the way. One reason I like Arca is that you can get all kinds of things in all kinds of price ranges to fit them: and what's more, while they may be a bit slower to fit up than some other types (Look at Manfrotto for that, one or two of their QR's are probably the next most common) ...the Arca type is much simpler and thus has less potential for fail if you cheap out.
There remain options for less-fiddly clamps, but expect to pay for those. (Arca is not naturally the picture of arthritis-friendly, any more than 'Quick' is necessarily the actual watchword, but you can buy some clever workarounds for that.
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Also it's more amenable to custom fits and neat little features like slots for a strap or whatever.
You can simply add an Arca clamp to about any tripod/monopod as well, or swap one on in many cases, and that's pretty useful. (I'm pretty sure Manfrotto does this, too. And of course they make some nice heads. Particularly one for monopods a lot of people like. (I don't actually *use* a head on monopods, but that's me.
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