Canoe paddles are a breeze, kayak paddles are very awkward.  If you lack a tow tether, stack both paddles together and paddle.  This technique is slow but does work.  When you get close enough to shore, toss like a javelin.  I find it much easier to hook the paddle shaft with my tow tether and drag the paddle across.  Canoe paddles can be stuffed in the top of your PFD (in milder water).  If you have a raft or canoe, you can carry inside the boat or tie to the craft.  Don't dilly-dally on paddle rescues.  Paddles are often dark in color and blend in well with water.  They can be very difficult to find when lost.  When rescuing as a team, put the strongest boaters with the swimmer, then the boat.  You can usually assign a single paddler to deal with the paddle.