bonus: LOC by project as of 2.10 RC1:

251163 BizHawk.Emulation.Cores
116543 BizHawk.Client.EmuHawk
39636 BizHawk.Client.Common
12220 BizHawk.Emulation.DiscSystem
9832 BizHawk.Common
8307 BizHawk.Emulation.Common
5992 BizHawk.Bizware.Graphics
3071 BizHawk.Tests
2790 BizHawk.Tests.Testroms.GB.GambatteSuite
1772 BizHawk.Bizware.Input
1450 BizHawk.Tests.Testroms.GB
1373 BizHawk.BizInvoke
970 BizHawk.WinForms.Controls
833 BizHawk.Client.DiscoHawk
773 BizHawk.Bizware.Audio
424 BizHawk.Bizware.Graphics.Controls
145 BizHawk.Bizware.Test

generated with cd src && for f in BizHawk.*; do printf "%s %s\n" "$(find $f -name '*.cs' -print0 | xargs -0 cat | wc -l)" "$f"; done | sort -hr

Rider does this now, and it also has some sort of metric for inter-project references. Here's what it looks like with that and transient deps both enabled (at b9c91443):

I'm not sure how to read it, but here's the data file it generates: BizHawk.argr