I wrote a small addon that adds some of the old lua functions:
http://sezz.at/download/sLegacy-20120418d.zip
Just install it and you can use the latest Recount (Graphs don’t work, they will crash the client!) or TinyDPS (and maybe also other addons, I didn't test a lot because most of the addons I use are written by me and they work with minor changes, but Auctionator und AtlasLoot for example will work too without any errors.). No text-editing required.
The problem is that Blizzard removed GetNumRaidMembers/GetNumPartyMembers, both functions are used in every addon that needs to access the number of players in your group, my small addon just adds them if they don't exist (and also some other functions, more to come).