My fields are next to my house. I drive through them once a day during the winter, when I take hay and cake. In the summer I walk through and make sure I've counted them all, and that everyone seems ok.
In the winter they come to the bike/bucket for cake. I try to keep this going in the summer with a handful of cake, as it's much easier to check them if the sheep come to me - all my fields are hilly, have becks and ghylls in, so even standing in the middle of each one you can't see it all.
I lamb in a barn/holding pens/small field across the paddock from my back door - I'm over there multiple times a day during lambing, doing hay, water, cake, seeing if anyone's lambed, seeing if any lambs have escaped.....
Just brought them in, half an hour ago, so having a cuppa and then water, hay, cake, pens.....