The 'loadplugins' option (and the equivalent --noplugin command line
switch) only stops regular plugins from loading, not indent scripts or
filetype plugins.
> For example: I found the following scripts were loaded whenever I open
> vim:
Doesn't happen for me when I launch with a .vimrc with :set
noloadplugins, or with vim --noplugin.
> I am wondering if there is better way to do it?
But, note that this will also stop plugins in directories other than
the system directory from running... if you still want to use the
plugins in ~/.vim, you'll either want to remove the systemwide paths
from 'runtimepath' then do "runtime! plugin/**/*.vim" and restore the
old value of 'runtimepath' - or some such.
~Matt