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Theres a couple possibilities.
If your feet were on a surface that had low or zero friction:
-you would feel the forces caused by slight misalignments of your body... these forces tend to make you fall over but your brain automatically compensates for those force by applying opposing forces using muscles. The problem here is that those opposing forces normally work using the friction of your feet against the ground... no friction, no ability to balance. you will definitely feel this (on your backside most likely).
-You would also feel the lack of work being done... kindof like riding a stationary bicycle that's set to no resistance feels different than when it's set to high resistance. You feel the work your doing... and in the case of sliding back you're not doing any work (other than moving your legs)
The other possiblity is that your walking along on a sheet of something that's sliding backward at the same rate your walking forward. This one's tricky because you'll still be able to balance. If the slope is gentle enough you would not notice that you're not doing work against the force of gravety... in which case you're right... you'd be fooled. On a steep slope of course you'd know right away that something was amiss... because it would be much too easy to walk (like walking up the down escalator at the same speed it's running feels funny)
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