I suspect when I check the depth of my local lake that, even not being a very big lake, is probably too deep to walk out of.
I would still encourage you to wear a life vest, especially if you're by yourself or there are few people around. People have drowned even in shallow water. Suppose your hardshell canoe or kayak flips and hits you on the head. A good vest will not only keep you afloat but also in a position where you can still breathe even if dazed or unconscious.
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Good point. In fact, in sailing, have been bashed about quite a bit just in a fixed keel boat. Thinking about a craft that could tip me in and I agree I should be extra-thoughtful about the danger of the water.