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Only for me, BG/IWD is funnier playing SOLO??
I prefer to play solo. Mainly because i don't like micro manage many party members and they usually have poor IA and prevent me from using my best spells without dealing friendly fire(i can use an cold spell with cold immune summons for eg). Last time, i tried to complete Shadows of Amn with an full party, but i honestly don't know how to defeat mindflayers without undeads and slayer form, that if i use too often, they leave... Was frustrating to fight then with an party, but solo, they become much easier TBH. Yes, i end up resting a lot, and abusing summons, since you can have 5 summons, 5 summons can be 1 planetar and 4 Efreets for eg.
I don't know how summons work on 2e, but on 3.5e, you can control up to your CL * 2 HD worth of creatures, so in order to controll 5 Efreets(each one with 8hd), you need to be at least lv 20. And use BBoD and Haste + Tenser's Tranformation against enemies with a lot of magical resist(IMO 3.5e has an better spell resistance system where it works more similarly to AC)