Just two observations -
(a) calls such as checking that the down and welded gear is, indeed, down and welded .... encourage a superficial attitude to running checklists ... the pilot is at great risk of falling into the trap of calling .. but not observing and confirming .. because the particular call relates to a non-event item. Similarly, with unnecessarily lengthy checklists, there is a tendency to 'hurry the checklist along' with a like trap ... most of us have seen this effect in simulator training.
(b) too heavy a reliance on written checklists can slow the whole sequence down .. why is it that many pilots 'read and do' routine check sequences rather than 'do from recall' (or by conventional scan sequence) and then 'read to check' ? .. it is a different matter with infrequently used abnormal drills, of course.