I'd much prefer many small programs that do very few things, very easily and very well; versus large programs that try to be everything to everyone. Incidentally, that is also the unix philosophy.
Yes, but as you know, that philosophy of a thing doing one thing well, is a statement on the scope of any particular piece of software, not its depth or capabilities. A program can, and likely should, go to whatever depth is necessary within its scope. If I want to do some serious text editing, I want a deep text editor like Sublime or gVim, not something like TextEdit or Notepad.exe. Some people can get by with those all right, and indeed I use simple programs like that if all I need is to quickly change a typo in a .txt file--but often I need more. All of these examples are text editors, they have a similar narrow scope, their "thing", they stick with what they should be doing and nothing more--however there is a huge difference between Notepad.exe and gVim when it comes to depth within that scope.
I don't get your screenshot though, how is this supporting your case? That seems, actually, to be a prime example of a utility that would really benefit from a few menus! I mean, this is exactly why menus are a good thing. Look, they even waste space with buttons for "Exit", "Save" and Load! What a waste of space and mental serenity. Bad as that is though, I don't see anything here that would classify as being out of scope, or example of software that is trying to do too many things. All of these are integral to the function of page scouring--one thing--and thus good example of a narrow scope with depth (as would be wget, the underlying engine behind this particular front-end).
I shudder to think what is behind that "Pro Mode" though. Ha.