As @Knightlie said, game changer at the time. I came in at something like version 3; mostly used it to write various utility programs - initially for internal use, but they "escaped". Still maintaining them to this day. A big plus point was that the output was a single executable; so simple to "install" (just copy into an appropriate place). Then version 8 appeared to sell its soul to Microsoft - went all "dot net" and suddenly needed an installer and multiple files. So we stopped at version 7.
Still not sure what to replace it with; unfortunately we used a couple of non-Delphi libraries, so Lazarus isn't an easy way out. I'd also like to drop Pascal, if possible, and have the option of multi-platform support. QT seems the obvious choice, but I'm not sure how our distributing software at no charge in a commercial environment would sit with their free licensing tiers (I've not bothered to check), and there's no way we could afford or justify a paying licence.