The 31-year-old is back in the Springboks mix this year after a lengthy battle with illness and was rushed into their squad for the home Tests against the Wallabies and All Blacks to cover a back-row injury crisis.
South Africa haven't won against New Zealand since 2011 and new coach Heyneke Meyer has five successive losses to overcome at Ellis Park this weekend.
And Burger admits he and his teammates have their work cut out for them if they are to see off the No.1 side in world rugby.
"I've been privileged enough to get a couple of victories over them, but let's be honest it's a tough challenge. It's not a thumb-suck, it's a challenge and there is a lot of hard work involved," he said.
"Yes, we're No. 1 and No. 2 in the world but we [the Boks], Australia and England are striving to catch up to them.
"They've been dominant in the last few years so it has been a continuous effort from us to try and catch up and pass them.
"They've been making it bloody tough for us. They just keep on running, they're like the pacemaker you can't catch.
"It is important to beat them, there are a few of us - which the media view as the previous generation - that have beaten them but it is one of those things in life where if you want something too much you never get it."