But if a block is already moving through water, the water tends to slow it down. If a massive object is already moving through space, its large mass makes it harder to slow. So now the analogy works backward!
Of course, the whole distinction between "speeding up an object" and "slowing down an object" in outer space is reference frame dependent. Water picks out one particular reference frame, and slows everything down relative to that frame. The Higgs field does not establish a preferred reference frame.