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Can't hurt to pull the rear drums off and take a peek at the friction surface of the inside of the drum and the brake shoes themselves.
If the drums are excessively grooved (brake shoes worn down the inside walls of the drum) - then it might take some work to take the drums off - assuming you are planning to do this yourself.
If you are having a shop do this - have them tell you what the inside diameter of the drum is and the brake shoe friction thickness. If the inner diameter of the drum is greater than 201mm - the drum will need to be replaced, original diameter is 200mm. If the brake shoe's friction surfaces are 1mm thick or less, the shoes will need to be replaced, original thickness is 4mm.
As you mentioned, the front brakes do the majority of the braking, so the rears can last a very long time, depending on how and where the car is driven. There are people that can burn up a set of rear brakes in less than 60K miles (~96 000 KM) and other that have well over 200K miles (~320 000 KM)on the rear brakes.
I usually get in the habit of checking the rear brakes when I do the fronts, bleed the brakes to flush out brake fluid every other year. I also like to change out the shoes when they wear about 1/2 way on me - usually that takes me to about 100K mile intervals (161 000 KM). Shoes are relatively inexpensive, about $36 a set here in the US. Check the drums for excessive wear - take some emery paper to clean up that crusty ridge that forms on the bottom of the drum and where it touches the hub, scuff up the sides a bit and I'm good to go.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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