Which is great until the moment your PCs get access to fast overland means of travel (flight devices, reliable means of teleport, etc.), at which point you become reliant on the dungeon itself to provide the interest.
That just means you need to have other fun stuff for the "journey". You might need to prepare certain things to get to the dungeon, even learn its exact location, negotiate with locals to gain access, or maybe even have a changed focus for the adventure to "help locals do a thing" with the dungeon just being part of the whole.
While it does not translate directly to D&D, think of a game like Ocarina of Time. You don't go directly from dungeon to dungeon, but instead each dungeon needs you to do a number of things before entering (or before you have a chance to deal with that dungeon's challenges). Before going into the Shadow Temple, go to Kakariko Village, and learn that an evil spirit trapped beneath the village has broken free and infested the Temple. In order to enter the temple you need to have the Eye of Truth, in order to deal with all the illusions in there, and getting the Eye of Truth is a mini-dungeon of its own. That's the kind of thing I want, but adapted to D&D.
That's why one of my favorite D&D adventures is Dragon's Crown. It's a really big adventure, and it takes you from Tyr, to Urik, to the Sea of Silt, then back across the whole setting to the Ringing Mountains, the Forest Ridge, crossing the Hinterlands, and eventually breaching the Dragon's Crown fortress. There are certainly dungeons, but there's also raider tribes, negotiating with a sorcerer-king, a weird gladiatorial game that's a cross between a battle and a football game, travel across the Sea of Silt, multiple instances of discovering ancient history, negotiating with man-eating halflings, handling thri-kreen driven mad by the adventure MacGuffin (and encountering a distant traveler possibly setting things up for later), and exploring a forest full of flesh-eating plants. In addition, there are a number of side treks you can throw in along the way. Now, that's significantly more than a 32-page adventure, but you could easily do the same thing on a smaller scale.