Not exactly, Cryengine is not a brush based engine like idtech 4, is a full mesh based engine, you make your terrain in the editor using the editor tools to sculpt the terrain and then you import meshes made in Blender, Modo, Maya, etc into the level editor to populate your world but nothing prevents you from making brushes in DR, then export those as a obj, but you would need to UV map and texture them in the previous mentioned tools. Cryengine editor is a tool set suited to make huge open worlds. Is possible to make small indoors levels but they are not build exactly like with DR.
peter_spy Cryengine has visportals (portals and anti-portals) they are mostly used for the indoor sections.
p.s - Forgot to mention Cryengine editor has a entire set of tools to build and edit box primitives (designer tool), you can think of them has brushes but they are in reality triangle meshes and work exactly like those in Blender for example. You can then edit and construct full structures like buildings using those, this tools are mostly used to "white box" a level before the real objects get imported but I've seen people build complex structures with it that stay in the final game.