I used to work as cook in a restaurant. There are many expensive as fuck knives you need in that environment in order to work efficiently.
At home, however, I think you only really need 4 knives:
A 10$ peeling knife for peeling shit and when you need to stab shit. Most peeling knives are curved so they are no good for general usage. That's why you also need a 10$ small kitchen knife or paring knife you can use for everything that doesn't require a long knife. Then you come to the two knives that should have reasonable quality: Two nice chef knives. Get a smaller one and a bigger one. With those 4 knives you can do everything that needs to be done at home fairly efficiently.
A bread knife is optional. If you want to fillet your own meat for whatever reason you also need a very good fillet knife.
Fillet knives are the ones where quality actually matters the most because they need to be hella sharp and flexible.

Also invest some money into good sharpening stones and learn how to use them. The spyderco sharpening system is very good if you don't want to spend a lot of money (protip: don't actually get the whole sharpening system but only spare parts. The sharpening stones or whatever they are called are very easy to use free hand)

But I agree, owning a lot of different knives for all sorts of different things is fun. (o/