There might be a different macro that makes your mousekeys work like in Healbot. I just use keybinds rather than mousebinds atm, as I got a rather simple mouse atm.
You might have heard it before, but a good tip when it comes to keybinds, is that you bind similar spells to the same key on all characters. E.g. my interrupt is always on C on all my characters. My main AoE heal and AoE dps is always on F. My quick heal(Flash heal, Regrowth, and the shaman speed heal which I just forgot the name of) are always on Q. That way I can pick up characters I haven’t been logged on to in a long time and start using them by muscle memory, until I start remebering how the actual spell works, and get back into it quicker. I will always be clumsy at first, but because I have the basics bound by muscle memory, it won’t affect me while doing average content.
Mouseover for healing also help you not having to worry about the task of targeting. If I log a new character, and forget to set up my mouseover macros before I enter a dungeon, I will struggle more as I will have one more step to go through before the heal goes off; Instead of “Hover over - Click keybind”, I get “Hover Over - Target - Click keybind”. More work, as in more milliseconds wasted to thought/process within the brain. Mouseover healing removes that middle step, and gives you quicker reactions.
Another point when trying to learn keybinds (I was a clicker until Blizzard introduced haste reducing GCD’s with WotLK, when the GCD’s was never shorter than 1,5 seconds for most spells, you could freely click without getting gimped. That is not possible anymore.) , is that you need to feel your way through it. Check where your hand lies comfortably on the keyboard, and place spells based on how your hand responds in the situation where you need said spell(e.g. never place a panic bottom, or key you need to respond with quickly, in a position where it feels clunky to move your hand. Your most important and reacttive spells should always be placed about where your hand is resting on the keyboard.
Last thing. I never use combo keybinds, because I can’t deal with that personally. I use simple binds, 1 key and spell goes off. I never use e.g. Ctrl+1 or Alt+1. Ctrl and Alt combos can go die in a fire for all I care. I either press 1 alone, or I won’t press anything. The moment I start attempting Ctrl+1, I will most likely push 1+Ctrl instead, and nothing happens(I am one of those people who often type “teh” instead of “the”" because my brain like to turn things around for some reason…
My keyboard also have all the F keys(F1, F2, F3 and so on) without space above the number keys, meaning I can freely use the F keys for binds instead of Ctrl and Alt combos. That gives room for plenty of binds even though I can’t use combo binds.
Good luck though. If you swap a lot, I’d really recommend giving the a little extra effort into making the default UI work. In the long run it saves you a lot of hassle.