Unfortunately, there's a good chance "that guy" is your boss.
Ugh, tell me about it. When I first got onto construction estimating my boss still didn't know how to operate the caps lock key when sending emails and wanted all estimates done on those green paper "take off" pads. Guess what, there are a ton of line item costs when doing a take off and a single estimate could easily span 7 or 8 legal sized sheets. To make matters even worse when you bring your estimate to him to review he often changes a few of your numbers, if you were smart you wrote the totals of each column on the bottom of the page and only had to re-add that one page, then total it, then re-multiply your labor burden percentage, then re-add your mats, tax, labor and burden then re-multiply your overhead, re-multiply your profit and finally add all of those things up.
I thought holy shit am I going to be the savior here and show these guys a thing or two. I made a very simple excel sheet that looked exactly like the paper take offs except it did all of the math for you. When you changed a number it automatically recalculated everything else and gave you your final number. Boss was pissed didn't like it because he didn't trust excel "those computers doing the bid". I was new so back to the freaking long way I went.
Once I was more established and the boss started getting to the level of being able to use google maps I finally started doing it purely in excel and didn't catch any grief. Everyone else in the office, 6 other estimators, still do it his way though despite me offering to share my spreadsheet.