Jeez, I grew up hunting in the 60's, just like you said you did. But along the way, I figured out that hunting can very different, depending on where you are. And if somebody sees grouse as roadside lunch pickup, and ground sluices them instead of putting them up (I have yet to see the guy who can guarantee no pellets in the body on flying grouse) to shoot them, well then, that's his choice.
I've been where, yes indeed, you just walk up and whack them with a stick. And I've shot lots of sharpies over dogs where they politely held to you walked up, got ready, and then obediently gave you a nice clean straightaway shot that you'd have to be a putz to miss. Lots of bird dog guys if they only experienced that kind of grouse hunting would go "<yawn>... boring..."
And, I've hunted grouse where it is an achievement to get them to hold for even the sneakiest of bird dogs, and when you do get a shot it's at brief glimpse of a feathered missile careening through the trees.
I've even hunted them in dog hair so thick the only way to hunt them is to shoot them on the ground - if you're lucky enough to have them give you at least a few seconds of view of them before they flush - because once they get up, you aren't going to be able to swing a shotgun on them, even if you can see them. Try that if you think all hunting on the ground is like shooting chickens in a yard. On the ground or in the air, shooting them can be ridiculously easy or frustratingly difficult.
Grouse hunting can be a very different experience depending on species, time of year, where you are, etc. It's a mistake to think that any kind of hunting is the same thing, no matter where you are. And it's a mistake to think somebody else's way of hunting grouse, somewhere else, is inferior to yours.
I don't ground sluice grouse anymore, but that's mostly because I get at least as much enjoyment out of watching the dogs work the birds as I do eating a grouse. If I was all about eating them, I'd go back to ground sluicing them with no apologies, and simply enjoy eating a bird without a single hole in the meat (unless you like eating the head too, of course)...