The day I purchased my Boardroom Membership I had a 45 minute layover turn into a 4 hour one thanks to a T-storm. That visit alone made it worth the membership fee....though I'm sure eating some machine churned pancakes tomorrow will make it that much more valuable.
...I'm not so much concerned about free food in the DL lounges as I am about free showers. I'd hate it if they started charging for those...and so will the person who sits next to me on my last leg back from TLV later this year.