Motivated by this idiom from Python, I have been experimenting with using a small helper routine from my library, MG_ANY. MY_ANY flips around the return value and count parameter of WHERE and is used something like the following:

if (mg_any(condition, indices=ind)) then begin
  ; use ind for purpose

This replaces the following standard code where count is checked after the fact (and often neglected by novice programmers):

ind = where(condition, count)
  if (count gt 0L) then begin
; use ind for purpose

To me, this small change of flipping the return value with a value passed back through a parameter/keyword makes this more readable and harder to write a bug into.