Mike,
I mostly work on existing courses but we do A LOT of green expansions as most older greens have shrunk in size over the years (very few get bigger). This shrinkage results in many of the best hole locations being lost. On many classic courses, some of the best hole locations are near the edges (and near the surrounding hazards). When greens shrink and the surrounding bunkers/greenside hazards separate away from the green surfaces, much of the design interest and strategy is lost. We work hard to expand those greens back to the edges of the fill pads and restore the hole locations that are so tempting and inviting. We do this almost universally on every course we work on. As I said, most greens shrink, they don't get bigger. This not only spreads out wear, it makes for more interesting and enjoyable (and challenging golf) for all levels. I am sure you understand why.
Mark