One advantage of a "big" airplane I haven't seen mentioned here is that they wind up being more economical to operate. After you get over the shock of buying a gas engine, servos, etc etc. I think the main reason that Goldberg reccomends a larger Tiger to someone with large plane experience is mainly to ensure that it isn't set up wrong, I.E. too small servos, flimsy linkages, etc etc. Zope Pope is spot on about more complexity, and he's just talking about an aerobatic airplane with basic flight controls and maybee smoke. A big warbird? 15+ servos, retracts, bomb drops, etc etc...... lots of work.
But the real danger of big airplanes is that you can't go back. Once you've flown a larger plane, the smaller planes seem, well, small!

Andy