I thoroughly enjoy my modular bed-room set-up. I use a series of six 3e/wX2n/s rooms, doors opening into a central n/s hallway, and one tile of hallway encompassing the unit. Then everything is really easy to just tack on as I get more dwarves, and travel to/from the central staircase up to the rest of my fort is unrestricted. I also like to make a large room around the staircase, and make that into a statuary, just so that every dwarf must pass by a display of fabulous wealth before he goes to his room. Each room gets a bed, cabinet, coffer, and a door. This is done less for dorf happiness and more so that I can feel like my mason is being productive while he grinds his way up to legendary. Between the nicely out-fitted rooms, the statuary, and the enormous engraved dining hall, I rarely have any dwarves below ecstatic.
I know that fractal designs are more space efficient, but given that you'll never need more beds than you have dwarves, I don't find this to be an issue. And honestly, I don't like embarks that make me struggle to fit my fortress into a tiny space. Sort of defeats the point for me. Also, given the hallway encircling every unit, it's never going to be much beyond 40-50 tiles from bed to staircase, even if all of the rooms are on the same z-level.