Have 2 now, the stock blue labeled WD 512GB nvme that came with my MSI GL65 Leopard, and the 2TB Micro Center nvme I plan on installing once I add the 2nd m.2 components to the laptop that MSI decided to leave off.
Around 5 for myself, first being a Plextor M5S in 2012.
The rest were Goodram/Wilk Elektronik which is a local brand here.
One nvme, the rest SATA.
For work - at least 10 SATAs.
Basically I've only bought 5 mechanical drives since then, with 4 being 60 000+ hours used Dell enterprise drives (750G and 2TB) and one new 2TB USB3 one.
Mechanical - backups only, seldom spun up just to sync and maybe check filesystem.
To me there's just no justification of using a drive with abysmal small files performance when the bulk of the OS and program files are small in nature.
Mid 2008: Bought three ES Intel X-25E SLC 64GB SSD's. I put them in RAID0. At the time, the multiplayer advantage was unreal. In Battlefield 2, I uncompressed the game files (they were actually compressed so a faster CPU also helped you load the game faster), but I also had a fast CPU with the game uncompressed at the same time. I was literally starting every round having the entire map to myself, capturing two flags while the remaining players were still prepping at their bases.
It was the only time when I was in the top 0.01% in some aspect in life for once.
Currently in use-
1TB WD Black NVMe, 512GB Inland Pro NVMe, 480GB Crucial M500 2.5" SATA in my main laptop (although perversely I'm considering swapping the 2.5" for a 2TB spinny HDD, the horror)
250GB Samsung 840 2.5" SATA (plain not Pro/Evo) in my secondary laptop
16GB Sandisk 2.5" SATA in an old Windows XP tablet I use sometimes
512GB Inland Pro NVMe, 256GB Inland Pro NVMe, 512GB Kingspec(?) M.2 SATA, 256GB Intel 545 2.5" SATA in external enclosures (all Type-C except the 2.5")
First SSD I bought was in 2012, a 128GB Crucial M4 to refurb a 2007 Macbook, and it changed my life. Haven't been able to go back since. Second one I bought was later that year to replace the spinner in a new HP Envy 15- that's the Sammy 840 that's still chugging along in my backup laptop after being used in more systems that I can count. Most recent SSD I bought was one of the 512GB Inland drives. They're just too good, and Microcenter is right there!
Altogether I've bought four bare M.2 drives, and I think six or seven 2.5" drives, not counting ones that came installed in a machine which would add around six more M.2 drives and a couple mSATA although oddly I don't think I've ever bought a system with a 2.5" SSD already installed.