As always, it depends on what you use the Qantas points for. If you can redeem them for a business class flight with, say, 3-5c per point value, then it's most definitely better to take the points rather than the cash. A couple of years ago I redeemed Qantas points for a JAL first class flight and got value of well over 10c per Qantas point. That was admittedly a one-off, but it demonstrates how much value you can get from Qantas points, at least occasionally.
As for points from supermarket spending being "small beer", again, it depends on your situation. If you have a family and make thoughtful use of bonus points offers, the number of points you can earn are definitely not "small beer".
I know we're talking about Qantas points and Everyway Rewards, but in my case I focus on Flybuys/Coles and over the past several years I've consistently averaged about 250,000 Flybuys points per year -- that 125,000 Velocity points is almost enough for one long-haul business class flight -- from grocery spending which I would have made anyway (and spending on gift cards for use in stores that I would have spent in anyway). Definitely not "small beer", and for that I'm more than happy to sacrifice the $1250 "Flybuys Dollars" which I could have used the points to redeem.