How to streamline logon scripts?

I currently have a logon script which utilises the ifmember and goto statements to select which network drives are mapped for each user. Unfortunately this list is quite extensive and I need to find a way to streamline this. Unfortunately our workstations do not have WSH installed by default so I cant employ this technology, (as I would also need to find a way to deploy WSH to each workstation!). If anyone has any suggestions, they would be welcome!

Thanks James