You haven't had my master list -- only the wants & gots list. My main list has one row per coin, so it is basically filed vertically, with each characteristic (description, metal, value, yadda yadda) in a separate column. For most countries this will fit onto the width of a 21" screen at 100% at 10pt. For some countries I have extra columns and sideways scrolling is needed.
The wants & gots list just has type numbers and dates, so with countries like Switzerland where there are dozens of dates for a given type, yes, there's a bit of horizontal scrolling. But IME most coin types are not issued unchanged (other than date) for more years than you can fit on a standard computer screen.
It does also of course depend on what you're viewing the list on. I do my record keeping on my iMac, but if I want to look at the list on my laptop there's more scrolling involved. I imagine my lists would be rather annoying on a handheld, but I haven't got one, so...