In all honesty, my advice comes from personal experience, not websites (some of which are very good incidentally.) I can therefore personally vouch for exactly how good the 5 minute rule is.
I have a 10 year old GSD, who I have had since he was a puppy (very cute when 12 weeks old!) I was getting somewhat fed up with his jumping up at me when I arrived home at my break time/ dinner/ end of play (at 6 months old, he was getting big, by 18 months he was 45kg), so tried the 5 minute rule. On day 1, he jumped briefly, barking, wagging etc...On day 2 he ran to me, barking, sniffed me, then walked off. On day 3, he looked at me, sauntered over for a sniff, then left me alone. I still do it to this day. This is not to say he doesn't get a huge fuss made after the 5 minutes, but that is what this is all about, it's about telling your dog(s) that you will stroke them, talk to them etc.. on your terms, you are the boss!
I can honestly say this is the one thing I would recommend that all dog owners do.