Speaking as one of the few people who will review large patches (like the new update page), I think slicing and dicing them would be a mixed blessing. Yes, it's easier to check each of a large number of small patches separately for style compliance, code clarity. proper use of libraries, error checking, etc., and it may be easier for the patch author to deal with piecemeal reviews as well. But that's only part of the problem, because I'd still want to review all patches as a whole, since the overall design may only be visible there, which means all those reviews would only be preliminary.

An alternative would be for the patch author to document the design before handing the first patch of the set for review, so it can be reviewed against the design (and the design itself for sanity) as well as for style etc as described above. This, however, is a change of habits and workflow that may cause as many problems as it may solve, or perhaps more.