I also don't travel second class.
I generally buy all the seats in the Executive class car so that I have the whole car for myself and I can stretch without having to commingle with other strangers.
As my 'concittadino' asps2 pointed out, the Bolzano Firenze train reverses the direction of travel at Verona PN therefore if you face forward at the beginning of the trip, you will be facing backward from Verona to Florence.
The window seat will offer the best view, no matter which direction you face, because if you sit in the aisle seat and the person next to you has a big nose the view will be obstructed.
When you travel on the Freccia train at high speed (which is not so high from Bolzano to Bologna since that is not a high speed line) the only effect on your brain will be caused by the wine in case you drink a lot of it on board. Other than that, traveling at 200km/h (that's the speed in that segment) will just be like speeding on the freeway. The only time the train will go over 300km/h will be between Bologna and Florence. But those 60 miles are almost entirely underground under 3 very long tunnels, therefore there is nothing to see outside.
However, now that I think about it, there isn't much to see between Verona and Bologna either (it's a boring plain), therefore in your shoes I wouldn't worry too much. The only slightly scenic view (if you want to call it that), is at the beginning, on the Adige Valley, south of Bolzano, which is bordered by fairly high mountains on both sides. Other than that, after Verona you can go to sleep till you arrive.