If your opponent is big enough, you can move through its square for free as well. My PCs have used it occasionally though.
Not really for free, it is difficult terrain, which makes it "difficult" to move through effectively without dashing
Because it is difficult terrain, it takes 25 foot of movement to move through a large opponent to a square on the opposite side of that opponent and 35 foot of movement to move through a huge opponent to the square on the opposite side. So unless you use dash this is rarely an option at all for medium PCs and only an option for small PCs if they start within 10 feet of a large enemy and have a 30 foot move.
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