That is a different issue from ease of use, and depends on what software you want to use. There is certainly a lot of software that is available for Linux.
I am far from sure how you would measure "most". Number of executables, number of GUI apps...?. These days there are probably more GUI apps for mobile platforms than for desktops in any case.
A lot of the most commonly used software (e.g. web browsers) is cross platform.
Of course there is a lot of niche software that is Windows specific, but a lot of that has or will move to web based SaaS (not a good thing in my view, BTW).
I am far from sure how you would measure "most". Number of executables, number of GUI apps...?. These days there are probably more GUI apps for mobile platforms than for desktops in any case.
A lot of the most commonly used software (e.g. web browsers) is cross platform.
Of course there is a lot of niche software that is Windows specific, but a lot of that has or will move to web based SaaS (not a good thing in my view, BTW).