Any time I see people mention the benefits of D, I see "compile
times" "compile times" "compile times" over and over.

I'm using very modest amounts of templates, for a fairly small
sized program (very early work toward a game), and I'm hitting
~15 seconds compile time in LDC and ~7 seconds in DMD. And I'm
not even compiling with optimizations!

ldc2 -w -ofextra  extra.d molto.d helper.d editor.d common.d
map.d object_t.d animation.d ini.d  -L-L. $@    -gc -d-debug=3 
-de -fdmd-trace-functions

dmd -w -ofextra extra.d molto.d helper.d editor.d common.d map.d
object_t.d animation.d ini.d -profile=gc  -profile  -g -debug
-color -L-L.

I keep putting stuff into new files, but it feels like it's
compiling everything from scratch / not getting faster the way
C++ does.

And I'm not even bringing up the 800MB of RAM required because I
dared to import std.regex. (On a laptop with 2 GB of RAM. RIP. If
I dare to have tabs open, the compile time goes into the minutes
thanks to swapping.)