Hey all! I was initially in the same boat as all of you, but after putting in quite a few hours understanding the differences in the movement I started to really enjoy playing Falcon again. It could potentially be control layouts? I'm not sure, but I'll post mine here as well as some key tips that have helped me nail movement:
Note that I use a pro controller to play:
ZL and L = Grab, ZR and R = Shield
X and Y = Jump, A = Attack, B = Special
Right stick = Tilt (debating whether tilt is better here than Smash attacks or not)
Other Settings: Rumble - Off, Smash Attack B+A - On, Stick Jump - Off (I prefer this, but I'm sure others will keep it on), Stick Sensitivity - Normal (haven't played around with this much)
You can do a short hop aerial by clicking A+X at the same time, thus making Nair strings fairly easily - just remember to fast fall after each Nair!
You need to put in practice time with dashing into tilts, smash attacks, jabs, etc. Once you get the timing down, things should feel a bit smoother.
Again, this is my preferred layout, but it's helped me with my movement. Hopefully this helps some people out!