Another satisfied customer!
No you wont be imagining it, it WILL run smoother, as did mine immediately after I changed them, and still to this day. If a sensor is duff, it'll be sending a duff signal to the ECU which will either be struggling like feck to sort the mess out, or not at all. Which in turn will affect the driveability.
Nice easy, relatively-cheap fix, giving a big 'bang for your buck' feeling!
Seems your list is getting shorter by the week, keep it up!