I feel I should chime in here and counter some of the Botania worship. I was skeptical about the mod and its design from the very start but seeing that it is so rich in content I couldnt resist at least giving it a try. And having it installed in three separate worlds which I played on well past the so called end game phase, I cant say my reservations about it have changed in the slightest. My opinion of it has worsened, if anything. Take my criticism with a grain of salt since it seems when it comes to the "why do you like playing modded" question, I am bit of the odd man out in this community as I take no great pleasure in grinding through complicated mechanics unless the aesthetics of having a powerful "setup" is good. And in my opinion, this is one place where Botania falls short.
One of my favorite things to do in modded is to build themed areas for the most complex mods. I enjoy the challenge of building a compact and neat setup. Anyone who followed my mod journal thread recently probably noticed that. Its easy to figure out a theme for a Thaumcraft build, or one based around tech mods like TE/AE and Mekanism. And Witchery truly inspired me to create something different than I have ever done before. Not to mention the new tech mods Immersive Engineering and Magneticraft, with their focus on intricate multiblock structures. Try as I might, I find it difficult to the extreme to make a Botania setup anything but a random sloppy mess, which demotivates me from even using it at all. I mean, what exactly is the theme of Botania? Theres nothing in reality or established fantasy tropes to explain magical flowers that cause boxes within an undefined radius to shoot magic sparkles at other boxes, filling them with magical liquid.
It seems to be a mod designed to challenge people to automate for automation's sake and with each update, it gets more stingy with its power generation which further increases the scale of the setup you have to build to keep it sustainable. I have spent more time trying to fill mana pools than actually using any of it. Theres no single killer app that makes it worth the effort, nothing that I cant do with other mods. And it really is a lot of effort, quite tedious to craft almost anything since most of it revolves around throwing stuff at something else.