Some others that are favorites of mine that haven't been mentioned...
Blicblock builds logic: http://modthesims.info/download.php?t=591323
You know how in sims3 you could play chess on a computer to build logic? This brings it back! Kinda. :) Sometimes you just don't have room for a whole chess set in your living room or an observatory in the backyard.
Many of Coolspear's mods: http://simsasylum.com/tfm/index.php?/forum/321-coolspears-mods-and-lots/
Most helpful, I think, are some of the no autonomous mods that you can't set with mccc. Such as:
- no auto check toddler
- no auto smash school projects
- No auto toddler ask to be picked up
- no auto view bubble blower
- no auto view talking toliet
- simghosts_no auto possess and no auto break stuff
Eat harvestable more gain, fulfilling plasmapacks and more fulfilling plasma fruit by judy: http://simfileshare.net/folder/18343/
Just Another Sim Fan's no angry/embarrassed alien discovery and no monster under the bed: http://simsasylum.com/tfm/index.php?/forum/307-mods-for-the-sims-4/
LittleMsSam... http://littlemssam.de/
holy moly do I use a lot of her mods! Instead of listing everything on her site (lol), I'll just put my favorites.
- Better Nanny
- Let Friends Age up (Like sims2!)
- More Social Activies
- More away actions
- Anti-fear training pets
- No sick dirty sad hungry pets
- Better Butler
- No burning sun in forgotton hallow
- no vampire invasion on community lots
- Small laundry overhaul
- Wake up overhaul (you know how kids always gasp like they're startled when they wake up?)
No Same Sims Everywhere http://modthesims.info/download.php?t=557279
No auto singing: http://nekomimi-m0de.tumblr.com/post/159619143116/no-autonomous-singing-mod
No ingredients required herbalism/serum/cooking/vampire drinks: http://modthesims.info/download.php?p=5349341#post5349341
Dollhouse smashing auto tweaks: http://modthesims.info/download.php?t=590819
Happy buffs changed to fine: http://modthesims.info/download.php?t=594488
Male sims use toliet standing up more often: http://modthesims.info/download.php?t=601559 (I don't know why the men sitting down all the time bugged me so much, but it did!)
Become a Sorcerer: http://modthesims.info/download.php?t=594052
The last ones I'll mention are from sim4me and there's a lot of them: http://www.deichschafblog.de/s4/bienchens-mods/
- City Life: Thirst tweak, festival tea
- City Life: no curry contest shirt
- City Life: Blossom Festival (formal wear)
- Vampires: No fake vampires
- Pets: No random pet clothing (I'm sorry but I hate it when people dress their animals up...)
- Pets: Pet walk by in other worlds (yay pets!)
- Other: Club Dancer tweak (Is this still needed? It needed a fix...fast.)
- Other: Sad Mourning (Only sad sims will mourn)
- Other: Less Bar Nights
- Other: More Children at Parks
- Other: No auto mold clay
- Other: No auto make a mess
- Other: No auto swipe
- Other: Less watch toddler
So those are some of the mods I have and think are important. Sorry, It's a long list!