I really just love wavedashing with Luigi. And SH double aerials with Luigi. I also really love Shinegrabs.
Bouncing off non-player objects with Wario's D-air (Smashville Balloon, Wolf's Blaster, Dedede's pillows, Shy Guys, etc). So advanced, I know. I'm smelling the roses here; clearly, I'm a Wario main.
Favorite technique: DACUS
Least favorite technique: L-Canceling.
I'm really surprised you enjoy DACUS. I've never met someone who actually enjoys that mechanic.
I feel you on L-Canceling, though. However, I don't think it's quite as bad as I used to think it was. What I do like about it is the pressure it applies to the player in situations which ask them to pay close attention to every character on screen, every second of the match. It asks the player to focus on reaction time more than muscle memory, as opposed to just focusing on muscle memory. Which I think is good because this relationship creates a spectrum of a micro-playstyle with muscle memory on one side and reaction time on the other side.
For instance, when Ganon's D-air gets spot dodged, the Ganon player can easily mess up his L-Cancel if he expected to hit the other player or their shield. Other examples are moves like Wario, Meta Knight, and Sonic's D-air's. I like that these moves ask the player to watch their character in order to get their L-Cancel right, which is cool because most of the time, you're better off keeping your eyes focused on your opponent's character. So it gives the player a reason to pay close attention to their own character as well.
When I look at L-Canceling like that, I can respect the mechanic a little more because I see how it impacts playstyles and overall gameplay, creating simple and elegant dichotomies in technique which players must learn to balance in order to perform at the top of the metagame.