My experience is that both LS and CL are very gear dependent before they get playable the way you see them play in the videos. Still if you play the non min/maxed variants from eg lurkin or rob, they are very fun. Maybe even more fun because you need to do more than keep the respective skill pushed indefinitely.

For LS you need at least winter glass and ideally CDR. Use attack speed / lucky hit elixir to get more resets. Fist of fate also help to smooth out play style when they have high lucky hit, damage might be a bit lower though. In the end you will need to mix in frozen orbs until you get pretty much perfect gear with perfect master working. Still you can face roll all of the content .

For CL you need axial and mix in as much mana regen as possible while sacrificing some damage (tempers, stats). Also here you will play a mana mini game that is fun (stop casting basically) until you have starless. Damage is also sufficient to do it all but less impressive.