There are several episodes of the first season of Earth: Final Conflict which were actually quite good. I own the DVD set and thus I know. There were plenty of terrible episodes in that season as well, which makes it hard for people to reach the good stuff. And best pseudo-human aliens ever.
I acknowledge the point about fast-growing woody plants. Vulcan doesn't have them, at least in the beloved Extended Universe material like Diane Duane's
Spock's World.
Voyager had several very memorable episodes for me, most especially
Sacred Ground (that's a terrible but brief summation). ST has a long record of being hostile to faith systems, which I approve of as a rationalist, but rarely the show goes beyond criticizing dogma and touches on the parts of the 'religious experience' that people still know and value.
Star Trek: Temporal Investigations would have been awesome. And it would have given them a great excuse to not only use more of their status-quo-preserving scripts (for a good cause!) but to bring back Q and have him be snarky. Having the Q turn to human beings to settle their civil war (what) would be like humans turning to blue-green algae to settle their existential and political crises. Lame.
"Most men are of no more use in their lives but as machines for turning food into excrement." - Leonardo di ser Piero da Vinci