At least from a healer's perspective. In Blitz at best I get tunneled by two DPS at a time, and it's usually short-lived before someone peels for me or in many instances I just spin a point against this for minutes at a time.
In normal BGs I regularly get tunneled by like 5-6 DPS at once and the damage and CC is overwhelming. It's much more intense trying to keep your ahead above water while also trying to keep everyone around you from also drowning.
Even trying to cap something in a normal is more intense because it takes twice as long.
I guess you could argue that normals are less stressful since there's nothing on the line. (No rating).
Just some random thoughts after doing regular BGs with friends this morning.