On the face of it, this was largely a result of chronology; coming as it did after WWI, WWII saw the utilization of technologies and weapons that first appeared in WWI, like Tanks, and which were then refined in the Interwar Period.

At the same time, WWI was the conflict that gave rise to the term Materialschlacht, Battle of Materiel, and the (rather nebulous) concept of "Total" War. One need only look at infantry divisions on the Western Front at the end of the war, and see the proliferation of heavy and light machine guns, the use of mortars and medium-and-heavy artillery, the presence of aircraft and tanks and armoured cars to see that WWI was very much a war of technology. WWII simply took what WWI had introduced and made it even more widespread. 60% of casualties in WWI, at least in the Western Front, were the result of artillery.

At the same time, and here I'd say military historians like myself are especially guilty, there's a tendency to stress the technological, industrial nature of the World Wars at the expense of the human and 'organic', so to speak, elements. Above all, the pre-WWI writers like du Picq, who stressed the importance of elan, morale, training and esprit de corps, were in a sense proved correct by the World Wars. The immense mental/psychological pressure placed upon the individual soldier (and civilian) in modern conflict meant that preparing them to fight as units, and ensuring that command and control as well as unit cohesion could be maintained on the battlefield, had only become of even greater importance than before. We also shouldn't forget that more tons of fodder were shipped to the BEF in France between 1914-1918 than ammunition; that the Wehrmacht of WWII was just as dependent on horse-transport in WWII as the Kaiserliche Armee of WWI; and that access to agricultural products, to cereals, vegetables and meat via livestock, was vital to feeding and thus sustaining the armies that fought both World Wars. Avner Offer's The First World War: An Agrarian Interpretation is especially helpful here, as well as Gervase Philips', Spencer Jones and Robert Citino's writings on British and German horse transport in WWI & WWII. I'd also recommend Alexander Watson's excellent book Enduring the Great War.