Are you happy with the iCloud on iPhones?

I have new iPhone 12 Pro, I switched from Samsung to Apple. My last iPhone was a 6s.

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I remember how slow and bugged iCloud was, endless "creating a backup.." and stuff like that.

Now I have a iPhone 12 Pro Max with 11.000 photos and im trying to upload them. Well, after 8 hours only 1500 photos are uploaded. Yes charged, restarted, paused/continininiuted, nothing works. Since 15 Minutes the upload dosent continue. No my Internet is strong, yes its charged, strong high interneet down/up...

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Again its the iCloud which destroys a lot of "premium-iphone-feeling"