I still do mine by hand and read the appropriate IRS publication for each form as needed (and very occasionally, I get advice from a CPA on an unusual case, such as 1031-B property exchanges). I find it gives me an insight into how specific rates, rules and regulations actually work, such as depreciation and rental property income. I find that useful, but it is admittedly old school. Interestingly, both my sons who use tax prep SW come to me each year to check and assist with their returns.
I wouldn't know where to begin with paper forms again. I guess the PO has them, but NY requires electronic filing.