Regarding the Emacs screenshot, here's another, from an early attempt to make Emacs more off-she-shelf usable for Scheme programming: https://www.neilvandyke.org/quack/
An actually better experience in Emacs (and part of what got me psyched to learn Lisps) is for Emacs Lisp programming: with a properly configured/installed Emacs, you can be browsing the documentation with rapid navigation, bringing up hypertext docstrings from your code , with links to the source code (perhaps the source code of Emacs itself), evaluating code that affects your running environment from both REPL and editor, etc. It's different than the Smalltalk-80 environment (which I also used, and wrote a little Smalltalk browser for), but there is some overlap. Modern IDEs let you do some of that, and some other things, but sometimes not as well, and Emacs people had this for a few decades.
Regarding the Emacs screenshot, here's another, from an early attempt to make Emacs more off-she-shelf usable for Scheme programming: https://www.neilvandyke.org/quack/
An actually better experience in Emacs (and part of what got me psyched to learn Lisps) is for Emacs Lisp programming: with a properly configured/installed Emacs, you can be browsing the documentation with rapid navigation, bringing up hypertext docstrings from your code , with links to the source code (perhaps the source code of Emacs itself), evaluating code that affects your running environment from both REPL and editor, etc. It's different than the Smalltalk-80 environment (which I also used, and wrote a little Smalltalk browser for), but there is some overlap. Modern IDEs let you do some of that, and some other things, but sometimes not as well, and Emacs people had this for a few decades.