The only people who use disks are console gamers, who choose not to give up on this outdated format. Most console gamers like being able to resale their games but at the same time this undercuts developers.
PC games are all downloadable NOW, every one of them. Even if you somehow find a game that's in DVD format, it will come with a licence # which you will have to register at Steam, Origin, UPlay, etc. Then you will be encouraged to just download the game. PC gaming really doesn't exist on DVD or disks anymore. To further back up the proof, many high end PC's don't even come with a DVD or Blu-Ray drive anymore and most high end computer cases/chassis don't come with a 5.25 drive bay.
Most people create an account with Steam, then pay for the game with a credit card, Steam card they got from 7-11, or a Visa Gift card. Once they have paid for the game and then they download it. How long you wait depends on how long it take to download the game. A very large game like Final Fantasy 15 can take 2-3 hours to download if you have a good internet connection speed. Sometimes the wait will be a lot longer if you try downloading during peak hours.
The last time I bought a PC game on disk format, it was Skyrim and that was back in 2011.