Factoid - Studies have shown that every hour spent planning saves between 6 to 8 hours of misdirected effort and rework (Kimberly M. Wiefling, M.S.).
Numerous studies have illuminated the fact that up-front investments in project planning pay off better than any conventional investment yet many managers and even some project team members would rather blindly rush forward into "getting actual work done". One reason for this may be the lure of "activity masquerading as accomplishment". Are there times when a "full speed ahead" mentality is warranted? Certainly, but often these are due to poor planning having resulted in an 11th hour crisis situation that needs to be addressed ASAP. Do yourself and your teams a favor: stand respectfully but firmly for the value of upfront planning.