Boardwalk is my home DVC resort, so I've entered Epcot many times through the International Gateway. Now my last trip was 2018, so I haven't used the IG entrance since the Skyliner came into operation.
I love the main entrance to Epcot and the music loop there--it really is very special and I often listen to that music loop at home to get a Disney fix. I usually come in that way once or twice a trip doing a park hop from Magic Kingdom, and of course, if I'm staying at a different resort. But the IG would feel like the insider's special entrance--short lines, a boat trip to my resort (or a pleasant walk). Usually, I go to WDW during the Epcot International Food and Wine Festival, so I would spend more time around the World Showcase, so the IG entrance was actually much more convenient unless I was going to a seminar over at the Festival Center (aka Wonders of Life pavilion). But honestly, it's become a tradition on the first night at WDW to go to Epcot whether it's for dinner at the Hacienda de San Angel or noshing at the Food and Wine booths, so there is still something special about coming in the IG and popping directly into the World Showcase. I'm always happy to visit Epcot no matter which entrance I come in and I enjoy both for different reasons.