On a daily basis, I use
Siri (including hey siri) to make calls, craft quick messages, set alarms, play music, perform quick calculations
Apple Pay
Force Touch (keyboard cursor, trigger multitasking, as well as quick actions on Safari, Maps, app store, messaging)
Spotlight search (mainly for contacts and 1password entries)
Touch ID
iCloud (photo library, keychain, drive)
Notification centre widgets (have 9 of them)
Occasionally,
Handoff
Airdrop
Continuity
Personal hotspot
Airplay / Airplay mirroring
Mail drop (does that count?)
Rarely / Never
Apple Watch app (no apple watch)
Health (but I do use Pedometer++ to track my steps)
iMessage (have migrated over to telegram)
Burst mode / slo-mo
I have also replaced many of the stock apps with my own 3rd party apps.