Did it yesterday and will probably do it again next week - not a problem.
I guess that's a US/not-US thing. In the US it is a problem, or at least soon will be, because all the NDB and VOR approaches are disappearing. Very soon there will only be GPS (RNAV) and ILS, so if you don't have GPS you're going to be pretty limited where you go. For training purposes there's nothing to stop you flying an old, decommissioned VOR approach under the hood in VFR (for as long as the VOR is there, which may not be very long). But if you actually want to fly around on an IFR flight plan, you need GPS.