I have all the Groove 3 courses you list here. Pretty decent. They just had a "Cubase" sale a week or two ago where everything was half priced.
I have this as well - much more in depth.
https://streamworksaudio.com/tutorials/swa-complete-cubase-pro-10/?fueid=18608&qid=27162
6 Hours worth of instruction. It's 35% off right now (until 5/31) with Code ELFF-6KRH-DHHE
Yeah - me too. Its a common complaint of Cubase Windows users - from what I've read, it's due to the common codebase they use for the Windows and Mac platforms. The UI does take some getting used to.
Rob Lee closed up his shop a few months ago. VSTBuzz now has some of his expansions for free at https://vstbuzz.com/freebies
There are free expansions for
Sylenth1
U-He Zebra HZ
U-He Diva
Synthmaster
Synthmaster One
As well as Dune 1, 2, 3 / Predator / Tal-Mod
I went to Cubase after Sonar died. I haven't regretted it (even though Cakewalk is alive and well). Midi and support for external devices in Cubase is unmatched.
Expression maps and per note expression are highlights.