Reverb on drums comes after the room mics have been adjusted to taste, if at all.
Great gear is irrelevant to a mediocre performance.
A really good preamp and mic do make a difference, a hi end compressor is the sound you are usually looking for.
A Reddi preamp is something all bass players should bring to the studio.
A great static mix is great, a mix with movement is more interesting.
The room in which you mix has more to do with a great final product than most anything else, as well as your FQ (frequency quotient - IQ applied to sound or your hearing skills)
Outboard compressors are better than plug in compressors.
Most plug in FXs are useless except Delays and Reverbs which generally work. Not always but generally.
A great arrangement is the framework people expect.
The center of the mix is critical and the communication center point.
You can make professional sounding tracks at home by yourself but it's more fun to do it with some trusted compadres.
You can only be consistently good at two or three instruments, let someone else create the other parts.
Headphones are great for learning to mix but never use them for a final mix.
Never commit to a final mix unless you have heard it on at least 4 different monitor sources.
An SM57 is the universal translator of sound.
Hybrid mixing needs to be a goal if you can't afford an SSL.
The CL1B is the holy grail of vocal compressors.
The GM EQ is the holy grail of EQs.
A great sound is quickly found with the following preamps 1073, 1081,
API550, V76 although out of the price range of most of us.
You will never be happy unless you own a U47 although you never will.
You owe it to yourself to get a C1 or API 2500 master buss compressor. Although you probably won't.
Mastering can be done at home although you owe it to yourself, one time, to at least find and use a professional mastering engineer to see how its' really done.
Knowing what mics to use for tracking reduces your frustration and lowers your mixing time.
These were my enlightening moments.