I tried Easygen for a cliff map and got millions of brushes too.
Before too long you'll get into all kinds of problem with nodes and brushes moving,
But if you still want to try, don't worry about what texture you apply in easy gen just apply anything. Then in Radiant select small areas of brushes and retexture.
If you try too many it crashes, Radiant has poor memory handling and its just too much for it. Any work on that many brushes not just retexturing will cause a crash.
My advice... create a small area of Easy that you need and use LOD or simple large brushes for the rest.
In the end I quit and restarted my map costing me 6 weeks work, the more you work with LOD the easier you'll find it. Use the lock/unlock select areas of verticies to move not just trying to move each one, use the 'area filter' to adjust the size of effects on LOD.
You can move verticies or drag an area for a simple effect.
Smooth out single bumps made with 64 area filter or players will get stuck in a single triangles if moved too deep. Try to use each patch carefully as you can only texture at its smallest 512x512 patch BUT you can place other LOD patches into each other to get a more natural look.
The real problem is finding enough textures that match and look right together.
You can also combine LOD with brushes just make sure you drop the edges deep enough under the map or the corners will show up as black areas or if the edge will be visible to player.
LOD is easy to adjust too you can detach and merge all day with ease, copy areas etc.
You can also use an image to creat an area of terrain just like EasyGen which is what I did for my map, using an actual map of the area I turned it into a greyscale to define the highs and lows, it worked a treat and saved me many hours messing around trying to do it by hand.
In the Radiant LOD drop menu you'll see LOAD from image.and save to image.
This will give you a taste of what you can do and more..
