Never regretted it. My previous Bimmer was manual and it was pain in constant stop'n go traffic we get daily.
The excellent Steptronic gives me all the control I need on the RPM. I use M/DS mode about all the time. I even lift throttle between shifts just for the fun of it. Once accustomed to it, it is very enjoyable. Most manumatics just suck, but not this one.
Frankly, I no longer see a point in that 3rd pedal. I wouldn't say this about our 2012 manual Civic.
2007 E90 AW 323i Step | Lowered 1.25"/1" | BMW Performance Exhaust | Debadged | Scangauge II | Style 162 18" & 161 17" wheels & rear 15mm spacers