Let me share my experience on certain schools with regards to 2nd time applicants.
I applied to CASE last year (2003 cycle) and was considered very late applicant, didn't get in. I applied again this cycle and was told just to submit my AADSAS application, since they already had my LORs, Essay and DAT scores.
I have been told by other schools to re-send everything, it just depends on the school you are re-applying to. In any case, I would check with the schools before I assume anything.
OP: On the other point, with whether schools will give more consideration (I think you mean preference), I think adcoms will look at all potential applicants equal - no preferences given to 2nd time applicants. The critical factor (in almost all schools) that would improve the chances of getting in is applying really early in the cycle.
Good Luck