We use Snobunjes. With a little practice, we've found them to be way more effective (and less back-breaking) than bending over and grabbing a ski loop. Usually one is all that is necessary to extract a sled but we have had some "double Snobunje" situations.
If you have a sled with unusually large diameter ski loops it might be a problem getting the Snobunje hook on the ski. I have Sly Dogs and I have to manipulate the hook a little to attach it but we haven't encountered any ski that the Snobunje wouldn't fit at all.