It is indeed sensible not to adopt updates until they have been tested for a while, although it's also fair to say that this delay will have happened willy-nilly if (a) you own a Samsung, and (b) you live not in the States but in the UK.
I was finally offered the update the other day, but this was many, many weeks after some other territories around the world. I did install it immediately using Wi-Fi, and without any loading problems - although getting used to the changes from KitKat was quite another thing! (I started a thread on that, to do with making custom notification sounds work properly)
On the whole I think Lollipop is nice-looking, and a definite improvement, my Galaxy S5 running faster with battery life seemingly much as before now that I'm no longer experimenting with the various changes (i.e. pretty good - over a day, and I consult my phone every waking hour). The new carousel-style app/webpage switcher feels very Windows-like in its usefulness.
But of course you can indeed postpone installing Lollipop until things really settle down, with all its bugs fixed, and I don't see why anybody who wants to be cautious should feel under pressure to follow the crowd. I have myself for instance spurned installing the new version of the Business Calendar app because the old one suits me much better - its look, font and weekly view all being much more appealing. I don't want the new whizzy look, and I'm unmoved by the hype. Similarly any person might prefer the not-so-oldfashioned KitKat as an OS for excellent personal reasons.
The trouble is, of course, that all worthwhile apps quickly adapt to the new OS, and then one is forced to upgrade! A fact of life. A great pity really, because it means you can't use a favourite phone for years on end (important if you have a limited budget and competing spending priorities) and still stay part of the general community, due to dwindling support. I have for instance a 2006 Asus laptop running Windows XP that has travelled the world with me, and is still going strong. I must have processed literally 100,000 digital photos on it since purchase, and it looks fit for a lot more. But I dare not connect it to the Internet now. My installed 2008 Nikon software would be instantly disabled, as Nikon no longer supports Windows XP and seems to implant disabling code whenever it detects unsupported software on old machines.
Lucy