Definetly not on MacOS where it is 200 MB , including the absolute necessary extension to make it comparable to VS. So I am assuming your <100MB is super bare bone.
Of course VS is going to be in GBs. There is absolutely no reason to go after a full install unless you plan to do web dev, xbox dev, C# dev, Android dev, IOT dev and a ton others VS supports and completely unrelated to Blender. For Blender you need around 6-7GBs which are basically the libraries needed to build those executables.
To give you an idea , the actually executable of XCode is 42kbs , I kid you NOT , the rest is libraries , plugins, secondary tools and much more. It totals a 7GB install.
The blender folder I have with only 2 builds is another 6 GBs. A single debug build for Blender is 3 Gbs alone compared to 1 Gb release build and those do not even come with CUDA kernel included. The lib folder that has all the libraries Blender depends (additional to the dev libraries getting with those IDEs) is another GB. CUDA runtime is a few GBs more.
So no VSC is not small, its just that it does not come with any libraries essential to build even the simplest projects. It does not even come with C/C++ support because it has to be installed as an extension.
If you dont like your IDE being in GBs range, stay away from native executable development.
PS: I only use VSC on MacOS and Linux cause I prefer it to alternatives so far. So this post is by no means me bashing VSC. Quite contrary I recommend it over XCode easily and I am very happy with it on Ubuntu too.