HI Padawan,
Well i will say it depends on the strategy u learned while preparing for GMAT and the habbit u have developed.
for example if u are preparing from
MGMAT there most strategies are based on drawing a fig to make things easy. like in RTD questions,Tree Structure for probabalility and ofcourse venn diagram in Sets and so on various strategies...
while in geometry i will say try making a diagram in Ds questions types as sometimes it become difficult to make a clear picture in mind although u may say that for eg if i have 2 sides and something like that given, i can find out easily but i will say in that case also it will help u since u r in time pressure u will tend to forget the things easily and may have to go thru the questions 2-3 times without diagram...
Overal it depends on the various techniques u have learned while preparing but yes in certain cases do make diagram where u feel that question is too long to make a picture in mind eg like a person travelled north then south east then west and so on.............diagraming this will help u solve easily..
hope it helpss...
thanx