For me, guest access to lounges is a key benefit of an FFP. However, as much as it increases the value of *G to me, I have only guested someone on just over 4% of my own lounge visits this year.
I've never had Skywards status, although that will probably change soon. On the limited occasions when I've been in EK J, the outstation lounges could have coped with 4% more pax. DXB lounges have always been overflowing however.
EK are wise to try and reinstate the benefit... I think it's limited use is mainly by FFs when on holiday with their other halves, and that generates a lot of goodwill. If companions being guested were using this excessively, then they'd have their own status!