Every boat is a little different. Different boats will have more or less prop walk depending on how they are set up. Wake board boats with direct or v-drives suffer from it the most. Other boats with direct drives will suffer as well but not near as badly. Especially if it has twin engines.
Most boats are going to experience this while in reverse. Reverse is the direction we all dread to travel and it is always an area that is unknown. When the shift control moves backwards, anything can happen. The boat will carry a mind of its own. Naturally, in a normal world, boats are going to want to walk to starboard, or the right, when in reverse.
As the old childhood scientist Bill Nye says.... Please, consider the following......
Next time you are on the water, find an open space with no traffic around and do an experiment. Place your boat in reverse and see how fast it will walk at different speeds in different directions. In some cases, with the wheel turned hard in the opposite direction, the prop walk can not be counter acted.
Once you know how fast it will move, now you are ready to learn how to use this to help. Ill first explain how I use it in my boat. When traveling down the fairway of the marina, my slip is on the starboard side of the boat. I know for a fact, that my boat will walk a considerable amount to starboard when in reverse. If I approach the slip in the current direction, bad things will happen. If I approach at an angle (which is the proper way to do it) then shift into reverse, prop walk is going to pull me to starboard, closer to the stern of neighboring boats that I would ever like to be. On the other hand though, if I take an extra 30 seconds to move past the slip and turn around the dock will now be on my port side. Great! Now, I can approach from the same 45 degree angle, then use slight bursts of reverse to carry the stern to starboard and line up perfectly with the opening of the slip.