There is more than a 'path' to DHS from Epcot...it's a nice, wide, well lit sidewalk. Yes, you can take the boat. BUT....if you leave the Gateway at the same time as the boat, and walk at a normal pace, you will beat the boat by about 8 mins. How do I know??? Been there, done that. We traded friendly insults with the boat CMs, telling them we would beat them to DHS...they said nope, just wait for the next boat and off they went. Well....we reached BW about 20 secs after then did....that was the last we saw of that boat until we got to DHS...we were headed to the bag check line as the boat came around the bend!
If you are walking from Epcot....head out, and then up the incline. When you get to the top, go left and over the bridge. You are now on BW property. When you get to the boatdock area, go to the right, just before you get to the Screen Door shop (just past the surry bike rentals). You will have the village green on your left now. When you get to Wyland Galleries (which you can see from the boat docks), turn right and go through the tunnel. You come out at the pool area. Cross there, over to the left behind Leaping Horse Libations, and then out to the sidewalk. Go left and you're back on track to DHS. This short cut saves about 5 mins walking.
It should take you about 20 mins to walk from the Intl Gateway to DHS.