If you use a slow stroke rate without a wetsuit you will start to sink between strokes if you don't have great balance or buoyancy. With a wetsuit there is a lot more leniencies to swim with a slower stroke rate and keep better forward momentum.
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sort of. Any wetsuit will give you some additional flotation. The thicker the suit, the more float it provides. It's important to keep in mind that a wetsuit won't provide as much buoyancy as devices that are specifically designed to be an aid to flotation, like a lifejacket or a throw-able cushion or life ring.
Wet suits don't keep you dry, but they can keep you warm. Wet suits are made of waterproof, closed-cell, foam-rubber (neoprene) which insulates even when wet. The two main things that determine how warm you will be are the thickness of the neoprene and the snugness of the wet suit.