It would be really nice to be able to see the columns below in sys.dm_exec_query_stats.
total_memory_grant, last_memory_grant, min_memory_grant, max_memory_grant
Currently there is no easy way to track memory grants except: shredding the XML of actual execution plans, comparing perfmon and profiler captures and Extended Events. The problem with these methods is they must be configured beforehand or post-mortem (and wait to the problem occurs again). Having these columns added to the dmv will allow the DBA to identify queries that ultilise high workspace memory. From there the DBA could reduce these if necessary (preventing hash joins, sorts, etc).