i use one on canoe trips for a fast cover up while i'm in the boat.
my rain suit takes a bit of hassle to pull on so for those sun showers that come on fast i pull out the poncho from a side pouch on the pack and cover up.
i have used my Army one for dog walks but i have rubber boots that keep my legs dry.the poncho was the first thing we were issued back in 67,even before the rest of our stuff.a one size fits all and does all bit of gear.