It appears they did, point to Nintendo!

Technically, Wii to Wii U was similar to PS2 to PS3 and Xbox to Xbox 360.

Yeah you are right. It was just a generation behind, which is why it didn't feel like a big leap. 

SNES to N64 on a technical level.

But from a personal standpoint GameCube to the Wii is my favorite. Motion controls, traditional controls, and the games: Super Paper Mario, New Super Mario Bros, WiiSports, Twilight Princess, Metroid Prime Trilogy, Super Mario Galaxy 2 were phenomenal. Aside from the GBA, I don't think I've had as much enjoyment on a Nintendo platform than I did on the Wii. 

In terms of pure visuals I feel the handheld leap from 3DS to Switch was gargantuan, we basically went from Gen 6 graphics to better than Gen 7 graphics in a single transition.

for revolutionary... it is the SNES to N64. It was night and day difference as it transitioned from 2D (with some 3D elements) to fully 3D. Everything else has been evolutionary. NES to SNES (8bit to 16bit) and then N64 to Cube to Wii to WiiU to Switch (all of which were evolution and refinement). It's that SNES / N64... THAT is the definition of generational leap.

The N64 for not only just like the 3D graphics (it really is the first "real" 3D machine in that it had perspective correct Z-buffering, not just polygons randomly floating all over the place) but the analog stick, the C-buttons (which would set the stage for dual analog) and the rumble pak also radically pushed game controllers forward in a massive way.

It's not the fault of the N64 that Nintendo really hampered it with a cartridge format when they could have incorporated discs and carts together and still probably sold the system for an affordable $249.99, which was supposed to be the initial price for the system anyway. 

... you missed out on multiplayer Bond and Perfect Dark and still call yourself a gamer ...? Just kidding, but that is too bad, that console was Fantastic.

Edit, I forgot to answer the question:

I will also say SNES to N64.  I haven't seen it mentioned but this also took you from 2 players to 4 players.  I started with the 2600 and have been gaming ever since.  Multiplayer was always big with my friends and I and this meant 4 people racing on Mario Kart instead of 2, or 4 people chasing around in a match of GoldenEye.  This was huge to us, with most games being a 3rd wheel no longer sucked, you had to have a 5th wheel before anyone was sidelined.

And relatively weak gen 6 visuals at that considering how 3DS games look compared to Gamecube games.

3DS to Switch for handhelds, and SNES to N64 for consoles.