I've enjoyed good perks like J class for myself and family, company car with gov plates ( Middle East), Gov ID Card (untouchable with these in the Middle East), free alcohol, free family cruises (when I drove cruise ships for a living), regular expensive gifts and bonuses etc.
Now travel full fare Y, but get paid more then when I travelled J (it's a bizarre world), work 5 months a year and out off all our competitors my company has the best travel policy which I consider a perk; they empower staff and allow you to book directly with corp travel and offer some flexibility (within reason) and choice of hotels/routing, believe it or not this has cut the travel budget by 40% on some ships. Good HR makes a big difference.